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I have Surviving Mars: first colony edition
on the GOG website it says I have Digital Deluxe Edition Upgrade Pack, Space Race, Colony Design Set, Marsvision Song Contest & Mysteries Resupply Pack DLCs in my library but GOG Galaxy only shows Digital Deluxe Edition Upgrade Pack & Mysteries Resupply Pack, I had to download and install Space Race, Colony Design & Marsvision manually.
Many with Season Pass, can't activate last DLC's from Galaxy.
Totaly forgot to manually download them from web!

Thank you!
It worked for me after manual installation from GOG Galaxy through game details overview.