I was able to follow the guide pretty much to the very end but there I got a bit lost. I end up with 6 individual 7 zip files (having Dawnguard and Dragonborn DLCs) in the working folder I created (which is outside of the Skyrim directory). As I read the instruction I should now move these 6 archives to the skyrim data folder and remove from there in my case 6 bsa files (HighResPacks 1-3, Skyrim - Textures, Dawnguard and Dragonborn).
Probably I got something about these last activities required wrong since when I start the (otherwise unmodified) Skyrim now, it crashes at the title screen.