Do i need fastDL to add addons on my server without error?

**i have seen people with alot of addon’s like traitor weapons, pointshop models and all that. but when people joine my game they get error’s and see pink. they have alll the game’s but i won’t work. do i need to setup a fastDL server?

if i need to can i get a tutorial to setup a fastDL without paying.**