Why does the Get Mods button don't work?

[McRoos]

That's all.
No matter how often and how hard I push the button it won't do anything...

 

[BobDole]

Probably have the Steam Overlay disabled.

 

[McRoos]

How do I fix that ?

 

[The_J]

Please take a look at this thread for the necessary instructions how to install a mod.