WhatIsSol: The last Windows GOG version should be: 55.1.1 2.1.41258W64G (28/04/2017 12:18).
UCP is an Unofficial Code Patch available on nexus and steam workshop. Using it or not is your choice, but given that the developers have not even posted to their forums in over a year and a half, I would assume no more official patches are incoming.
Ah, I see now. For some reason in GoG Galaxy it reports a different version than is watermarked in the start screen. The watermark says 55.1.1.2.1.41258W64G (28/04/2017 12:18).
If the develpers aren't going to fix the still-existing bugs, this should count as abandonware - and they should release the source code so fans can fix the game for them. :-/ And also facilitate the creation of mods.
So is there any point for me to report bugs with the in=game bug reporting option?