Game works with proton 5.0 and the following proton tricks command:
protontricks 45000 dotnet35sp1
I merged a fix into Wine Mono for this, a .msi build is available here: https://github.com/madewokherd/mono/actions/runs/1140664798
For now, this also requires WINE_MONO_OVERRIDES=Microsoft.Xna.Framework.*,Gac=y, but I have some changes in the works that will fix that.
Compatibility Report
https://store.steampowered.com/app/45000/Sol_Survivor/
System Information
I confirm:
Symptoms
Attempts to install .net 3.5 giving the error
Then a launcher window opens, click play, and the game does not load.
Reproduction
As above
steam-45000.log