PkHex problem when adding/deleting new Pokémon via right-clicking

[TokoyamiTheDark]

I just got PkHex's latest version, but something is bugging me quite a lot. I cannot delete nor add new Pokémon. When I right-click to add/delete, I get this error:

Exception Details:
System.MissingMethodException: Method not found: 'Boolean PKHeX.Core.SaveFile.IsSlotOverwriteProtected(Int32, Int32)'.
   at PluginPile.Sorting.SortingPlugin.<>c__DisplayClass12_0.<LoadContextMenu>b__0(Object s, CancelEventArgs e)
   at System.Windows.Forms.ToolStripDropDown.SetVisibleCore(Boolean visible)
   at System.Windows.Forms.ContextMenuStrip.SetVisibleCore(Boolean visible)
   at System.Windows.Forms.ToolStripDropDown.Show(Control control, Point position)
   at System.Windows.Forms.Control.WmContextMenu(Message& m, Control sourceControl)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(HWND hWnd, MessageId msg, WPARAM wparam, LPARAM lparam)

Loaded Assemblies:
--------------------
System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Private.CoreLib.dll

PKHeX, Version=24.11.11.0, Culture=neutral, PublicKeyToken=null
C:\Users\laura\AppData\Local\Temp\.net\PKHeX\QyCzwiS0E264VvTiz1e4Ku26D81_k2Y=\PKHeX.dll

System.Runtime, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Runtime.dll

System.Windows.Forms, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.11\System.Windows.Forms.dll

System.ComponentModel.Primitives, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.ComponentModel.Primitives.dll

System.Windows.Forms.Primitives, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.11\System.Windows.Forms.Primitives.dll

System.Drawing.Primitives, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Drawing.Primitives.dll

System.Collections.Specialized, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Collections.Specialized.dll

System.Threading.Thread, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Threading.Thread.dll

System.Collections, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Collections.dll

System.Runtime.InteropServices, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Runtime.InteropServices.dll

System.Threading, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Threading.dll

System.Diagnostics.TraceSource, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Diagnostics.TraceSource.dll

System.Drawing.Common, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.11\System.Drawing.Common.dll

Microsoft.Win32.Primitives, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\Microsoft.Win32.Primitives.dll

System.ComponentModel.EventBasedAsync, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.ComponentModel.EventBasedAsync.dll

Accessibility, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.11\Accessibility.dll

System.Resources.Extensions, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.11\System.Resources.Extensions.dll

System.Memory, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Memory.dll

System.Drawing, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.11\System.Drawing.dll

System.Numerics.Vectors, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Numerics.Vectors.dll

PKHeX.Core, Version=24.11.11.0, Culture=neutral, PublicKeyToken=null
C:\Users\laura\AppData\Local\Temp\.net\PKHeX\QyCzwiS0E264VvTiz1e4Ku26D81_k2Y=\PKHeX.Core.dll

Microsoft.Win32.SystemEvents, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.11\Microsoft.Win32.SystemEvents.dll

System.Linq, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Linq.dll

System.Collections.Concurrent, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Collections.Concurrent.dll

System.Collections.NonGeneric, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Collections.NonGeneric.dll

System.ComponentModel.TypeConverter, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.ComponentModel.TypeConverter.dll

System.Text.Json, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Text.Json.dll

System.ComponentModel, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.ComponentModel.dll

System.Text.Encodings.Web, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Text.Encodings.Web.dll

System.Text.Encoding.Extensions, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Text.Encoding.Extensions.dll

System.Runtime.Intrinsics, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Runtime.Intrinsics.dll

PKHeX.Drawing.PokeSprite, Version=24.11.11.0, Culture=neutral, PublicKeyToken=null
C:\Users\laura\AppData\Local\Temp\.net\PKHeX\QyCzwiS0E264VvTiz1e4Ku26D81_k2Y=\PKHeX.Drawing.PokeSprite.dll

System.ObjectModel, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.ObjectModel.dll

System.Private.Uri, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Private.Uri.dll

System.Runtime.Loader, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Runtime.Loader.dll

System.Windows.Extensions, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.11\System.Windows.Extensions.dll

System.Net.Http, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Net.Http.dll

System.Net.Primitives, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Net.Primitives.dll

System.Diagnostics.Tracing, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Diagnostics.Tracing.dll

System.Diagnostics.DiagnosticSource, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Diagnostics.DiagnosticSource.dll

System.Net.Security, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Net.Security.dll

System.Security.Cryptography, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Security.Cryptography.dll

System.Net.Sockets, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Net.Sockets.dll

System.Threading.Overlapped, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Threading.Overlapped.dll

System.Net.NameResolution, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Net.NameResolution.dll

System.Threading.ThreadPool, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Threading.ThreadPool.dll

System.Security.Principal.Windows, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Security.Principal.Windows.dll

System.Security.Claims, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Security.Claims.dll

PluginPile.RoamerTool, Version=1.7.1.0, Culture=neutral, PublicKeyToken=null
C:\Users\laura\Documents\PKHeX\plugins\PluginPile.RoamerTool.dll

System.IO.Compression, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.IO.Compression.dll

PluginPile.Common, Version=1.7.1.0, Culture=neutral, PublicKeyToken=null

PluginPile.SortingPlugin, Version=1.7.1.0, Culture=neutral, PublicKeyToken=null
C:\Users\laura\Documents\PKHeX\plugins\PluginPile.SortingPlugin.dll

theSLAYER Overworld8, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
C:\Users\laura\Documents\PKHeX\plugins\theSLAYER Overworld8.dll

System.Console, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Console.dll

System.Linq.Expressions, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Linq.Expressions.dll

Microsoft.CSharp, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\Microsoft.CSharp.dll

System.Reflection.Emit.ILGeneration, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Reflection.Emit.ILGeneration.dll

System.Reflection.Emit.Lightweight, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Reflection.Emit.Lightweight.dll

System.Reflection.Primitives, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Reflection.Primitives.dll

Anonymously Hosted DynamicMethods Assembly, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null

System.Configuration.ConfigurationManager, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.11\System.Configuration.ConfigurationManager.dll

System.Xml.ReaderWriter, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Xml.ReaderWriter.dll

System.Private.Xml, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Private.Xml.dll

System.Net.WebClient, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Net.WebClient.dll

System.Runtime.Serialization.Formatters, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Runtime.Serialization.Formatters.dll

System.Xml.XmlSerializer, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Xml.XmlSerializer.dll

PKHeX.Drawing, Version=24.11.11.0, Culture=neutral, PublicKeyToken=null
C:\Users\laura\AppData\Local\Temp\.net\PKHeX\QyCzwiS0E264VvTiz1e4Ku26D81_k2Y=\PKHeX.Drawing.dll

PKHeX.Drawing.Misc, Version=24.11.11.0, Culture=neutral, PublicKeyToken=null
C:\Users\laura\AppData\Local\Temp\.net\PKHeX\QyCzwiS0E264VvTiz1e4Ku26D81_k2Y=\PKHeX.Drawing.Misc.dll

System.Text.RegularExpressions, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Text.RegularExpressions.dll

System.Diagnostics.FileVersionInfo, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Diagnostics.FileVersionInfo.dll

System.Text.Encoding.CodePages, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Text.Encoding.CodePages.dll

System.Diagnostics.StackTrace, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Diagnostics.StackTrace.dll

System.Reflection.Metadata, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Reflection.Metadata.dll

System.Collections.Immutable, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.11\System.Collections.Immutable.dll

--------------------
User Message:
An error occurred in PKHeX. Please report this error to the PKHeX author.
 

...PkHex then closes on its own, not saving anything. What am I doing wrong? Is there something needed that I lack? Do note that I had to format my PC due to ransomware, so I lost all software I had...