Arma 3 Locked PBO

I am currently trying to unlock a mission pbo so i can edit it and mess around on it but its locked and pbo manager gets an error. If someone can open and post it for me that would be greatly appreciated and also if you can tell me how I can decrypt it myself that would also be awesome if not just opening it up will be cool thank you.

has this other mission, the encryption of this and older but I am very lay I can not decrypt