Unpacking a PAK file?

So I have a totally valid reason for wanting to unpak MY OWN WORK. So long story short… I forgot to make a back up LOL! I have a game where I have been trying to achieve some clever camera tricks for controlling pawns both in and out of VR without having to change the actual pawns code, but instead use separate controllers. I made a working concept that was done mostly in the level blueprint. I packed that up and brought it to a game dev event and showed it off. I still have this file. The project file I unfortunately tried to move all the processes into the controllers and the whole thing went bunk and now I can’t make out which way I did things. All I have is the camera transform replicating to the controller transform logic that I needed for this project. That was the tough part to figure out so If I have to I can remake the whole thing, BUT I did do a lot of stuff to the character class and I don’t want to have to re-figure out what I did. I was hoping to unpack my .pak so I can see what stupid little thing I did that broke the whole system. At current all my character does is spin in place regardless of what controller I assign to it and or what order things get possessed. It’s really annoying.

Since I have the original project could I get a key from it to extract the .pak???