Please uninstall the game in the Epic or Steam client, and delete the folders:
C:/users/{UserName}/documents/Paradox Interactive/Surviving the Aftermath/ (Move any valued save games elsewhere first of course!)
C:/users/{UserName}/AppData/LocalLow/IceFlake Studios/
To see the AppData folder you'll need to enable View Hidden Items in File Explorer.
THEN unsubscribe from all mods in the Steam workshop and/or Paradox mod site.
Then install the game again and try it.
All the best!