Sorry, am I blind or are we again disadvantaged compared to the Steam users and have no access to the new beta patch? :(
You have to have to be part of the Beta Team. You will get a unlock password.
1) You have to use GoG Galaxy to access the beta builds.
2) In GoG Galaxy, on the game page, click the 3 little slider symbols
3) click on Manage game installation.
4) Select the correct Beta Channel to access, and use the password to access the Beta Build..
Don't be in too much of a hurry, several problems with the 1.1.0 Beta so far. it will be updated with a few fixes before it is released to the normal channels!
... and use the password to access the Beta Build..
And what IS the password, Dr. Einstein ?
Beta Channels are by default Off and you can add a Private (Beta) Channel but for which you require a PASSWORD. No PASSWORD -> No Beta.
In Steam, all you must do is switch the Beta from 'none' to 'betatest - Betatest version'. No Password required.