If i do install/install.php It goes straight to saying that the forum is already installed and jumps all the checks
why are you running the install.php for doing an upgrade?
run the index.php script as mentioned in the guide. it will will present a page with your forum info, and then run the correct script when you proceed, which would be upgrade.php not install.php
https://www.ubbcentral.com/doc_upgrade7.php#upgrade