Cannot download any addons

[pawelte-legacy (pawelte)]

When I try to download any addon from garrysmod.org, I get that error:

Error!
Could not connect to remote server

You tried to access the address http://garrysmod.org/downloads/?a=view&id=52706, which is currently unavailable. Please make sure that the Web address (URL) is correctly spelled and punctuated, then try reloading the page.
Make sure your Internet connection is active and check whether other applications that rely on the same connection are working.