After some research,
blank page could be caused by insufficient memory,
set php memory limit to higher
another possible issue is core/config/config.inc.php
it turn out , on my machine when i was migrating a remote modx to my local machine,
the write process onto config.inc.php somehow halted with some unknown error which caused blank page.
So, the page was a template file, and it turn out to be an invalid php script file.
ive to redownload my config.inc.php and try rerun..
But some how in the end, the final setup failed half way, with no errors again, content got loaded half way with no errors.
Yes, in the end, i applied the latest upgrade files onto the root,
and rerun setup,
but this time, it went well and it was a successful upgraded and the site is working!