Do you still have this problem?

yes

Did you change the directory of the game?
Can u see mods folders here: `x:\Steam\steamapps\workshop\content` ?

I didn't changed the directory of the gaem
I have mods folder here C:\Program Files (x86)\Steam\steamapps\common\Cossacks 3\mods
and there is no mods folder here C:\Program Files (x86)\Steam\steamapps\workshop\content

steamapps\workshop\content\333420\ ??

yes, there is 333420 folder and list of subfolders
855818461 - empty
855863185 - empty
855882129 - empty
855916926 - empty
855977051 - empty
870599630 - with files
873048118 - with files

Can you check what files it is?

Write on paper before you start!! click on mod then click on favorite there is a star icon next to it click the star then click on subscribe then go back to configure game click on mod manager on tab and then select which mods you wanted

引用自 Emperor Locutus：

Write on paper before you start!! click on mod then click on favorite there is a star icon next to it click the star then click on subscribe then go back to configure game click on mod manager on tab and then select which mods you wanted

I have mod mad mamager problem too. I tried what you say but my mod manager is still empty. Some people sya that deleting .afc files should work. I tried it either but no success. Mod manager used work in my old computer.