i followed these rough explained steps multiple times and it doesnt work! i installed Crossover 19.0.1xxxx, i downloaded PKHex as a standalone exe file, i opened up Crossover and first installed the Microsoft Net Framework 4.7.2 (Latest version as you told), after that i created a new bottle, named it PKHex, and have chosen Win 7 Bottle (not 64 Bit), did a right click on the bottle and clicked on open drive C, in this folder i pasted the PKHeX.exe file as you said. then I clicked right on the PKHeX bottle again and selected the command thing, clicked on browse and selected the pasted PKHeX.exe file. The program respnded something with 255 and then the PKHeX Icon appeared in the bottle.
But when i open it -> the Pokeball icon pops up in the dock, jumps for 2 seconds and then disappears without opening, doesnt matter how often i click on it, it comes, and goes after 2 seconds.
Where is my mistake? What am I doing wrong?