Why are these files not in your http://www.teamzr1.com/ubbthreads/ folder? You are getting this error because your UBB.threads install is not in the http://www.teamzr1.com/ubb760/ folder, and you're attempting to run an upgrade from a folder that does not have an install in it.

The only time you remove folders from the install archive is when you're doing an upgrade, which you're attempting to do in the wrong folder.

I am a Web Development Contractor, I do not work for UBBCentral. I have provided free User to User Support since the beginning of these support forums.
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