For those looking for help with modern issues, the GOG Community Forum remains the primary place for troubleshooting specific errors like black screens or save-load bugs.
Firewatch update primarily addressed stability and controller support, specifically introducing the ability to view the game's version number on the settings screen.
Added native support for DualShock 4 controllers on Windows.
While it is frequently associated with the Steam version, the changes listed for v1.09 (released in May 2018) included the following:
There has been historical discussion among GOG users regarding the synchronization of updates between platforms. While some major updates (like the Firewatch Audio Tour ) eventually reached most versions, certain technical controller-specific or backend fixes were sometimes delayed on GOG.