I'm not sure what problem you are having when you say 'nothing works'. I've installed several FG repacks over the years including one only a couple of weeks ago. Open and terminal and cd to the directory that contains your FG download, then:

1. export WINEPREFIX=$HOME/.wine_gamename
2. winetricks -q dxvk xact xinput vcrun2022 win10
3. winetricks -q vkd3d corefonts win10
4. wine setup.exe
5. cd installdirectory
6. wine gamename.exe

I separate the winetricks lines as sometimes winetricks gets overwhelmed if you call two many functions. I can assure you that this does work, though the repacks sometimes take ages to install. Personally I use rutracker as my source as the games come pre-made with wine.