It's easy but not very well documented. Usually done after major OS upgrades. Gets rid of the "BOOT LOADER IS TOO OLD. PLEASE UPGRADE." warning on system boot up.
First install the TDMC/Pacy World, LLC. root CA in your browser to enable the ability to load private and secure encrypted content. Then re-open Unibia.net using the secure URL.
You may also want to kindly send a note to your browser vendor requesting that they install the TDMC/Pacy World, LLC. root CA by default so that you (and others) no longer have to do it manually.