I added support for vault format 6 in the latest sanitizer version. You can use this command to decrypt all files inside a vault.
To do this, you need to prepare a directory to resemble a vault structure. While the directories may be lost, you can use arbitrary names, as long as they match the expected length (2 characters and 30 characters) and pattern (a-z2-8):
masterkey.cryptomator
d/AA/AAAAABBBBBCCCCCDDDDDEEEEEFFFFF/
Put all your files inside of AAAAABBBBBCCCCCDDDDDEEEEEFFFFF and start the vault decryption.