If you are facing error "Initialising error (SEF) Some files of the game client are corrupted, please run repair via launcher or reinstall the game.", please uninstall all mods (and in case of SF mod - delete line exec("mod/sf-mods/init.cs"); from file unit.cs)
Additionally, this error may occur if some of the game files have been modified.
If you still have issues - reinstall the game. Make sure to fully delete the game folder before reinstalling - to make sure that there are no leftover files.
If after all those steps you still facing this error message - please, e-mail us at firstname.lastname@example.org
Please, send game logs (How to extract logs)