Right click ‘Life is Feudal: Your Own’ and open Properties
Then follow to BETAS tab and enter this access code in order to activate beta:
Click on ‘Beta branch’ in the dropdown list
Steam should start downloading this version of the game. Once it has finished, you will be able to try the patch!
Just a heads up that there is a known rare bug on Steam, where beta branches cannot initiate download process. In order to fix it you can go to Steam Settings and in ‘Account’ tab, under ‘Beta participation’ click on ‘Steam Beta Update’. Restart Steam and the downloads should restart.