Welcome to the Cryptomator Community 
Good approach, but unfortunately you looked at the wrong spot^^ The Cryptomator installer has its own repository, see https://github.com/cryptomator/cryptomator-win.
The installer checks if the file C:\Windows\System32\drivers\dokan1.sys exists and compare the installed dokan version with the bundled one. If it cannot find any installed dokan (event thou dokan1.sys exists), the installer just assumes the bundled Dokan is newer.
There are two reports on our issue tracker, that dokan1.sys was not removed after uninstall. If this is the case, in the thread Vault unlocks and assigns drive letter, but later the drive cannot be opened - #11 by infeo you can find a solution to remove it.
I would suggest a reinstall. If you want to keep your settings, rename the folder %appdata%/Cryptomator to something else, uninstall and afterwards rename it back.