Fyi. Since the classic version is not supported anymore.(extremely old)
The upgrade zip is no longer available.
there is only the one install zip file which can accomplish a upgrade only.
Since your version is very old a caveat is when upgrading you will need to do it in steps to get to ubbthreads 7.5.8.
Unless you want to manually alter the database.
The reason being is that a global moderator group was added to the groups that did not exist before so you need to upgrade classic first. Then import to say v7.0 then upgrade to v 7.5.8.
