Where can i download campaign addons?

[Smoky]

I want to download campaign addons, got "we don't go to ravenholm".

[Stark Raven]

gamemaps.com and gamebanana.com are your best resources for addon campaigns. The Workshop is not an optimal place to get large files such as campaigns.

[Smoky]

Any suggestions: what are the best addons to choose from?

[Stark Raven]

Urban Flight is a good one to try for variety. Lots of interesting crescendos.
I Hate Mountains is a classic paragon of Valve-esque level design.

Other than that, look around. Whatever strikes your fancy, give it a try.