what needs to be clear is what the difference in a INSTALL folder and
the existing UBBtreads folder where the functional version 7.5.9 is
Are you calling INSTALL folder as functional one, IE FTP and overwriting existing 7.5.9
OR ftping a 7.6.0 folder as a sub folder of 7.5.9
This install doc is written for programmers and not end users and that is confusing
As to folders, again as per above UBB URL, says an INSTALL folder, and what folders it says NOT to upload have not
all other folders, files are in the root of public as a new ubb760 folder and NOT in the 7.5.9 functional folder
which has no install folder
So ubb760 folder HAS all the files/folders that were in the ZIP file except
Do not upload these:
cache_builders/custom/
includes/
styles/wrappers.php as upgrade url says not to
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.