Okay, for sv_downloadurl you do not need anything. You just have to basically upload a cstrike folder to your webhost, leaving all the maps and gfx (download files, except amxx) in the cstrike folder on the webhost. You then, put the url of the website, for example
www.bgleague.com/cstrike/
Now, add the sv_downloadurl to your server.cfg file. Restart the server and it should work.
Be sure the sv_downloadurl is like this: sv_downloadurl "www.bgleague.com/cstrike"
I hope this answers your question and works for you, if not let me know and i can give it a try in setting it up. Now, for free webhosts, i know you may not be able to do this because it hogs bandwith.
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