@MrStonex the latest version of Wyvern Battle Pack updated for FAF can be found here: https://forum.faforever.com/topic/364/ (Please tell me if you find any errors) Sadly i never got a permisson from the antares unit pack author to update/maintain his mod, so i can't help here. Just be sure every player has the same files and fileversion from all mods. A desync is almost in all cases caused by different mod files or versions.