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I don't know how long it takes to update the installer listings, however as a Linux user it's my only method of getting the new update. GOG Galaxy doesn't have a native Linux client, and running it in wine just updates the Windows version over the previously installed Linux version.
This question / problem has been solved by air-deximage
The installer is the same and there is no patch which is freely downloadable from the popup in "My games".
At some point today the update was added to the downloads section. Thank you.