Cannot open game after altering .dll file

I decided I wanted to mod the game (Epic version) and downloaded a mod that overwrote the original “Assembly-CSharp.dll” file without backing it up or realizing that the mod was not updated for the newest version of the game. Is there any way I can get the original .dll file back without reinstalling the game or is my only option to wait on the mod author to update it?

I would ask someone to send it to you. I don’t own the PC version or I would help ya out

Back up your save then reinstall