I did this but I have no DLC to install it!?
all else DLC worked just fine
it is 1 installer and says missing files and it is only downloading 1 file with 23 MB
The DLC links in GOG Galaxy under "Extras" for the standalone installers are broken. They both download the setup file "setup_the_witcher_3_wild_hunt_184.108.40.206.exe" which then will nag you that "files are missing".
Instead, download the DLCs from the GOG website, there the links are working.
The filenames should be:
the search only shows the normal DLC for me which I already "bought" and downloaded
I only find the DLC website where I download the same file (27MB) with the "missing files" error message again