step 2 is specifically for old old old versions of osTicket.
8. For versions 1.6 RC1-RC2 Only
and
Once you’ve overwritten the files, rename config.php to ostconfig.php (config.php is found in root osTicket directory).
are actually one step. I'm not sure why my edit to the git hasn't been approved to fix that formatting issue.
A blank screen usually is the result of a PHP error. Please consult you PHP error log and see what the error is.
As a side note you did not provide us with any information about your environment (webserver, php version, osTicket version, etc.)