Login => ACP => Login => Customise => Manage Extensions => Re-Check all versions
The "CURRENT VERSION" column highlights versions in what I'm guessing is red and green - but it doesn't display/assign any alt/hover text or icons/punctuation next to the version numbers, meaning that a red/green colour blind person (such as myself) can't figure out what the system is trying to tell them. Inspecting the element only shows a hex colour-code.
My suggestion would be that hovering provide a "Up to date" or "Expired" tooltip...
Alternatively, an icon or punctuation next to the version number (such as , ... vs. a , or ). This would also assist with other vision impairments as presumably such symbols would have alt text, or be unitext with a defined and pronounceable meaning.