My config.inc.php tells me - $VERSION = "6.2";
So i must download 6.5.5 - overwrite the whole folder. Run server.com/ubbthreads/install/ and choose upgrade?
But for some reason it shows me blank page. no errors, nothing. Just blank. Perhaps starting over with 6.2 would help? But where to find 6.2 blank install?
You almost have it right.
you need to type in your browser:
server.com/ubbthreads/install/upgrade.php
by using server.com/ubbthreads/install/
only it just displays the index.html page which is blank to protect anyone from browsing your folders