Yeah, you really wanna post this in the
Server Discussion section instead:
https://forums.alliedmods.net/forumdisplay.php?f=129
As for the download issue, good that you fixed it, however still worth noting:
Typically servers offload their custom resources to an sv_downloadurl, to increase the speed.
Traditionally, downloading directly from the server will only happen at a few kB/s, regardless of the servers capabilities.
This means if you're downloading large files (such as model files, sound files, and especially map files) it will appear as if it's stuck, because it's going so slow.
By moving the content to sv_downloadurl on a web server somewhere, the speeds become unlimited. 😁👍
The error you're having sounds like you're missing files needed by the game to render properly.
Try reinstalling the addon, and then manually copying model files etc to your CS 1.6, and see if it works then.