For addons purposes

Epic "updated" the zosEGSStarter.exe and setup.exe files, the starter now mandatory requires dotnet40 which doesn't work in WINE or Proton, it never worked. Older dotnet calls used to be handled by wine mono but unfortunately, since the requirement is now dotnet40, wine mono can not handle it. As for setup.exe, it requires IE8! Which also doesn't work in WINE and Proton anymore.

Used Winetricks and Protontricks to see if I could install dotnet40 and IE8 to circumvent the issue. But none of them can be successfully installed inside WINE or Proton. Basically, impossible to install the game fully after the initial 300MB installation. And even if I bring in the entire game from backup and since zosEGSStarter.exe can not be launched, it is impossible to play with Epic Account.