...
After logging-in, same:
Hmmm.... onto Research!
The following Q/A helped resolve this problem:
https://drupal.stackexchange.com/q/166358/72255
Visiting PREP2 now greets with a CAS login instead!
Upon authenticating, we get to the landing page of the PREP tool!
We do have a module that seems to be out of date: admin_menu — let's update it!
Get the downloaded tar.gz file onto RHEL7 and extract and then run the Drupal's update process as before...
