Ruudvangoal: Yes i believe so my GoG Galaxy extras are set on English all the time and i clicked the 1.02+ > 1.07 file there (there is only one).
CraigEvans: i installed patch 1.07
got an error message at the end about corruption
re downloaded the patch
tried installing the patch
same message as OP gets,wrong installer
guess its just another badly tested patch
I'm having a similar issue.
My 1.7 patch goes "not responding" towards the end of the patch install.
(This is on a fresh install of Witcher 3 all files dl'd today.)
My game version ends up v1.7 but I wanted to run the patch again and got the message you're getting.
I can't seem to install the Ciri dlc pre or post patch 1.7 either.
Installer tells me "This version of the base game is not supported. Please update your game version with the latest patch."