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At one time they use to have indicators on the page that told you what was new. They dropped it a while back and I have no idea why. Can't remember exactly when it was though. Might have been around when they added the extra language drop down list but not sure.
IceCreamKimi: This is ridiculous, why do we keep on having to guess as to what has been updated?

GOG need to sort this mess out. For people with big libraries it's a huge hassle that could easily be fixed.

Either put a changelog in the forum or put the update flag on the part of the game that's been updated like they used to.
I completely agree. This should be an easy fix. A post in the forum is all that's really needed.