Oh boy. What an ordeal this has been just to do something I bought an action replay years ago to be able to do. First thing I did was set up the hidden administrator account, before you brought that to my attention I had no idea that even existed. I tried it with both versions of sgm (3.0 and 2.4), then both versions again with my regular account, still the same error. I tried to connect to my server with FileZilla and got this:
I couldn't make sense of this seeing as before a few days ago I didn't even know what an FTP server was. Should be noted I got the same error using my IP address instead of localhost. And unfortunately smallftpd.free.fr is now defunct so I can't look up that error code.
I figured something is clearly blocking the FTP server from working and it's not my firewall, so I tried turning on the native FTP server from Programs and features. However it gave me an access denied message, even on the admin account. Like any foolish Windows user I clicked on the "Tell me how to solve this problem" link knowing full well it would be useless and it wasn't even the right error code.
Thanks for your responses, hopefully this mess helps you guys better understand how to use Pokedoc's tool on Windows 10 (with crappy hardware nonetheless).