ASP, IIS, just to make sure that the site has the appropriate permissions, I gave the site full control of the entire ubbthreads directory. I am updating the forum locally on a test server, we host our own servers, both test and live server. That's how I was able to restore and update, and restore and update, and restore and update... you get the point.
The contents of the test server is the exact back up of the live server (may be a couple of weeks old, since I started trying to update). All this got dropped on my laps a couple of months back, and I was informed that Infopop performed the upgrade to the current version 6.3. I have no idea what was done, and how. I have a mirror thread going on the Infopop UbbThreads board, and so far, no answers.