What is FastDL?

I thought that it meant fast download, meaning that the content is hosted on a server and sv_downloadurl pointed to it so that the client didn’t download from the server at a measly 20 kbps. Is this true, I just want to clarify?

Also, you can download form the server without FastDL if sv_allowdownload and sv_allowupload are set to 1 right?

Yes, that is correct. As for the convars, if sv_downloadurl is set then sv_allowdownload is completely ignored. sv_allowupload has nothing to do with the download system (hence its name, sv_allowupload

Is that what you were looking for?

Perfect. <3 you.