Always launch the game through the Launch button inside Frosty Mod Manager, not via Steam or the EA App directly.
If mods aren't appearing, try deleting the ModData folder inside your FIFA 18 directory and relaunching through Frosty. fifa 18 frosty mod manager encryption key top
directly in the download due to legal reasons; users typically find them in community-maintained lists on platforms like Alternative Tools : Many FIFA modders now use the FIFA Editing Toolsuite Always launch the game through the Launch button