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MUCH BETTER! Before following-through with the update process, let's update CAS and LDAP related modules and then re-load the Drupal's update process...

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Okay...

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We have encountered rules module related error before... so before we move onto the Front page, let's update the rules module and then re-run the Drupal's update process...

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Let's update the rules_conditional module too... On the live site, go to Available updates and download from the provided link:

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Upload the tar.gz file directly onto the server

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Remove the rules_conditional folder (do it either via FileZilla GUI or command line) and then extract the archive

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Remove the archive... and let's re-run the Drupal's update process...

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Awesome! Let's hit the Front page — we should be greeted with a CAS login page!

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AWESOME!!! After logging in... ... ...

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Huh!? Let's try a completely fresh browser session...

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After logging-in, same:

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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!

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Upon authenticating, we get to the landing page of the PREP tool!

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We do have a module that seems to be out of date: admin_menu — let's update it!

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Get the downloaded tar.gz file onto RHEL7 and extract and then run the Drupal's update process as before...

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Voila! Error Free Landing Page!