Download GSM Fields of Honor XII from ModDB, install it to the MOW Mods folder (If you use Steam then you need to install it to Steam\steamapps\common\Men of War Assault Squad 2\mods.

https://www.moddb.com/mods/german-soldiers-mod-fields-of-honor

After that, go into Steam, right click on MOW AS2, then click on "Properties", then Betas, then select "previous_patch - Downgrade to the previous patch." as the beta. Let the game finish reinstalling and verifying, then launch the game and select this mod and GSM in the ingame mods launcher, there you go, no more weird crab soldiers, missing textures and vehicles.