[KrU$ty]

I'm not sure but wonder if this is the main problem:

"Step 1: Upload all files and directories including at "vbulletin" directory to the
directory where vBulletin is installed."

It may be unclear what is meant here. It sounds like you are supposed to upload the vbulletin folder with the other folders inside just as in the zip file. I'm just not at all sure that is what was intended though. When I did that, I simply got blank pages. I then started over and uploaded the folders and files within that vbulletin folder but NOT the vbulletin folder itself. I just uploaded the admin, photos, etc. to the root directory of my forum.

I could then access the classifieds page. Now after that, I had other problems and so have given up on this but I'm just trying to help.

I had the same thought, and tried it both ways, however i get the same blank page on classifieds.php. Im pretty sure it has nothing to do with my server setup and everything to do with the mod itself. Uninstalled.