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The update weighs in at 42.74 MB and contains the November 2021 Android security update. You can read the official changelog below.
2021.1019.24 (North America)
2021.1019.25 (AT&T Locked Device)
It’s worth noting that the Surface Duo is yet to get the Android 11 update which Microsoft promised to deliver before the end of the year, and it seems increasingly likely they will miss the deadline.
Meanwhile, Surface Duo users can wait for the update to be pushed out to them, or they can download it by Checking for Updates in the System Update section of the Settings app.