When I list my games via GOG browser I see there is an update (1.4.5a-RC-1). Interesting. There is nothing in the changelog. After the download I have files labeled 1.4.5a-rc-1. These files have different sizes than the 1.4.4a-rc-1 equivalents so something must have changed. Any ideas?

Look here:

https://www.gog.com/forum/general/the_what_did_just_update_thread_part_2_the_search_for_more_updates/post1454

I know it's been awhile, but ...Thank you.