HELP! An unexpected error occurred: Malformed masterkey file (App 1.5.13)

Hi, I would like to know if this solution applies in my case. I have the files still encrypted and the backup key. I just don’t have the 'd ’ folder that was accidentally deleted. The question is if with the backup key I can unlock my files again by creating a new 'd ’ folder and putting the files in there? Or do I just need to use this backup key in the vault to be able to open the files? I appreciate if you can help. Thank
[Error adding masterkey key to vault - Dokany - #8 by DVDSEC]