Maybe you have downloaded a newer version or it could be that you're missing something that is needed for the mod to work, It could be an expansion or another mod linked to it.

All the Mods i was able to play are now Blocked by Exclusivity - what is that?

Go to mods -> In the screen in the top right is a button called options -> Check the box -> UNCHECK ALL NEW appeared mods -> Have fun with your mods! It worked for me