Lieste: This is wrong.
The 454MB patch from GoG.com only patches the base game. It does not change the dlc package, nor the Expansion.
Hickory: Bullshit. Try reading the patch notes. Here's an extract:
"Hearts of Stone
ACHIEVEMENTS:
Fixes issue whereby items needed for Achievement titled I Wore Ofieri Before It was Cool could not be acquired from Ofieri merchant
QUEST:
Fixes issue whereby players had to buy Ofieri set from merchant to start quest titled From Ofier's Distant Shores.
DLCs
Adds missing download image for Skellige Armor content.
Fixes issue in DLC quests whereby occasionally human foes could have empty Health bars and could not be killed.
Adds missing interaction to chest in quest titled Scavenger Hunt: Wolf School Gear.
Fixes issue whereby Nilfgaardian gauntlets could cause unsightly red box to appear beneath Geralt's feet."
I read the patch notes. I also installed patch 1.11 alone, and checked file versions for the dlc in ep1. All were still set to 2015-13-10. Some of the reported fixes confirmed by myself and others to not be functioning (specifically availability of items at Ofieri merchant).
Downloaded and installed the updated 2.0.0.41 Ep1... and the fixes were present.
I think if you do it through Galaxy it patches everything up to date just by updating 1.11, but this *doesn't* appear to be the case with manual patching.
Feel free to do it your way, but I don't think it will work.