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Today I was getting messages that the game was failing to update through GOG Galaxy. I solved by manually applying the patches myself. However, now the game won't let me load any of my saves as it says the Victorian DLC Starter Pack is missing, but I can't find any mention of this pack in the DLC section in either GOG Galaxy or the website. I have the Deluxe version of the game.
GOG support sorted this out for me and I can now load my saves again, the DLC has been added back to my account and the issue is now resolved.