[Kalcor]

It's not important at this stage. Every download could have its own thread if needed. If the sa-mp server struggles to deal with downloads, it could return a URL instead of a file and the files could be fetched over http.

I can't see situtations where 1000 people download at the same time. Players only download files once. When they reconnect, the files are still in the 'cache' folder. So assuming most players already have the files, there may only be 1-2 players downloading at a given time.