So does this mean that the main game has been patched ?
Yes, the main game has been patched.
The main installer is currently GOG-18 Version 2.07 BUILD 160919
Additionally, there are three patches available in GOG's library:
1. PATCH 2.07 (GOG-17) 1.1 GB to updated to 2.07
2. PATCH 2.07 BUILD 160919 (GOG-18) 1.2 GB to update to the version of the current installer
3. PATCH 2.07 BUILD 161025 (GOG-19) 14 MB to update the current installer to the newest version
Check the file name of the installer you downloaded. The last to digits show the GOG-Installer version. For example setup_victor_vran_18.104.22.168
.exe ist the current installer GOG-18
Unfortunately I'm not much of a help regarding Galaxy since I don't use it.