Download the files from a trusted source like ModDB.
Your friends have a different version of the rules.ini file. Fix: All players must delete the reborn_cache folder in their Documents/RA2 Reborn folder. Then, verify files via the launcher's "Repair" utility. Red Alert 2- Reborn Mod 2.1 -MOD- -INSTALL-
: Reviewers highlight its balance, noting it is suitable for both online competitive play and relaxed single-player sessions. Download the files from a trusted source like ModDB