Hello Godriole and welcome to the forum
I guess you can't load yor Enderal saves?
Maybe this is a problem with write permissions.
Run the three exe files in the game folder as administrator (EnderalLAuncher.exe, skse64_loader.exe, SkyrimSE.exe).
Disable the write protection that Windows may have set on these folders (right-click on folder -> Properties -> uncheck "read-only").
...\SteamLibrary\SteamApps\common\Enderal Special Edition
C:\user\"username"\AppData\Local\Enderal Special Edition
C:\user\"username"\Documents\my games\Enderal Special Edition