I remember in the earlier versions there were more insignias on the Red side such as Cuba, Yemen, etc. Where can I download the skins?

Were the theatre-specific Red side insignia removed except for Russia and China?

You checked all theatres? like kuwait or other?You asking for insignias for helicopters, or general insignias on houses/ blocks?

Insignias on helicopters. For example, the Red side in Cuban campaign had the Cuban roundel but now its Russian instead. Same with Yemen and the other Middle East locations.