Unable to decrypt files with sanitizer

[Michael]

Unfortunately no. Without the corresponding Masterkey, there’s no decryption possible anymore. (also not with sanitizer functions)

Cannot open encrypted files

Sorry, but no. The masterkey is unique. The only chance you have as restoring the old masterkey from a backup. Either by renaming the .bkup file that Cryptomator creates in your vault directory, or from the version history of your cloud storage provider if you have any.