My friend and me frequently play Command & Conquer 3 and Command & Conquer 3 Kane's Wrath (latest Steam versions) via the launcher.
Operation system is Windows 10.
We keep getting the following error in the attached file ("out of sync"). Games are properly installed on both computers. We do not know how to solve this problem.
We do not cheat or anything, we simply would like to play Command & Conquer 3 and Kane's Wrath online.
Thank you very much for your help!