I re-download my games that have been updated so I have the latest version saved on my games hard drive. Is there an easy way to find what games have been updated, besides looking through my hard drive of downloaded games and checking the version number with the one that is available to download? It would be nice to have a recent updated game list.

GOGrepo is a python script which can do that, you can search on here.
Also there should be an updated flag in your library which highlights updates (its very hit and miss).
There is a thread: https://www.gog.com/forum/general/the_what_did_just_update_thread
Its all a bit hit and miss I am afraid, no real changelogs, no ability to download old versions/patches even if things gets broken/removed. You can find more:
https://www.gog.com/forum/general/provide_a_full_and_complete_changelogged_download_system

https://www.gogdb.org/changelog

https://www.gog.com/forum/general/the_what_did_just_update_thread

Thanks for the links. I wish gog would put a filter to sort by updated. This would make it much easier.

They...do? That's kinda what the "updated" filter is for. The other options are "my collection" (all games) and "hidden".

I totally agree that it would be cool if gog put a filter to sort by update.

Bots obviously wouldn't know, unlike members would...