[Maxximou5]

If you have HTTPS setup correctly, changing from HTTPS to HTTP isn't your problem. As explained here
You have to add a folder called csgo after 84 or rename 84 to csgo and put all the contents to download inside.
That's all you have to do.

Pages explaining why you need the game at the end of the url:
http://forums.srcds.com/viewtopic/1077
https://forums.alliedmods.net/showthread.php?t=129178
https://developer.valvesoftware.com/wiki/Sv_downloadurl