Can't install mods

[Azedenkae]

Hey there, I'm having a problem with installing mods... I can download them just fine and everything, but when it comes to installing the mods, after clicking 'Install Mods' in the 'Install' section, nothing happens, and it just says 'No mods installed'...

Anyone know how to solve that problem? I checked the mod folder, and the mods I downloaded ARE there... just, they can't be installed...