I also ran into this problem. I’m running Windows 11. Initially, I tried upgrading using Cryptomator-1.6.7-x64.exe. That’s when I got the error. I uninstalled Cryptomator via Control Panel and then reinstalled using Cryptomator-1.6.7-x64.msi. Installation went smoothly and I am now running Cryptomator 1.6.7 using Dokan Library 1.5.1.1000 Bundle.
Hope this helps.