FOR EVERYONE WONDERING
I saw a comment on the other website from where you can download the game how to launch it and start a new game without it crashing.
The different options were :
- Add it in Steam as a Non-steam game (also easier if you play with a controller thanks to Steam-input (from what I understood))
- Or if it shows "Fatal error: File:D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsPlatformMisc.cpp] [Line: 439]", don't start the game that's named "PokemonEmerald.exe" when you first open the "windows" file. Instead, go to the file that says PokemonEmerald, Then go to binaries, then win64, Then you'll see "PokemonEmerald-Win64-Shipping.exe" in the win64. Run it as administrator and it should work! If it doesn't, relaunch it a few times and it'll work :)
And while you're playing : DON'T FORGET TO SAVE OFTEN, 'cause it's still a demo, and it crashes sometimes, and it doesn't save automatically