Right click your avast taskbar icon. Click 'Virus Chest', Avasts Virus Chest will
open showing all quarantined apps. Right click the one you want to return and
add exception to. Problem resolved. Happens to me on a few of my apps. Hope
This did nothing. On the next update attempt the file was quarantined again. I changed from Avast to Kaspersky Free. Perhaps it will do me until my license with Avast runs out and I can buy another good AV that actually catches things. Kaspersky has good ratings, but I'm leery to trust it. But since Avast is blocking some programs and people want to shit on it for doing its job rather than GOG for not making their updater like others do where virus scanners won't pop it, I need a protection that may be less secure so that GOG can go along GOGging.
apparently the last update caused Avast and AVG to treat Galaxy as a threat. Of course there is nothing in GOG Galaxy that should be marked as a virus or malware. We are investigating this false positive, and we're trying to fix this ASAP.
Here is a temporary workaround: https://support.gog.com/hc/en-us/articles/115004238733-Virus-or-malware-detected-by-Avast-or-AVG-after-updating-GOG-Galaxy-to-1-2-31
Thanks for the update. It's nice to see you guys do care! :) Thank you so much on behalf of everyone suffering from this for at lest attempting to fix this issue. I for one am greatly appreciative.