According to the official patch notes on Steam, this version addresses specific graphical bugs:
In an era of loot boxes and live-service ephemera, sitting down with a DRM-free copy of a political sim, installing it from an offline backup, and losing an entire weekend to budget spreadsheets feels almost revolutionary. That revolution, however, is bloodless—unless you forget to raise the pension age. Then the retirees will riot. And they vote. Democracy 4 V1.65 -GOG-
: Like other versions, the GOG build allows for easy editing of the underlying text files, enabling players to tweak policy impacts (like the link between car tax and usage) themselves. Overview of Democracy 4 According to the official patch notes on Steam,