Can i manually decrypt a folder encrypted with ES File Explorer?

I had **encrypted a folder using ES File explorer**. Then later on, I upgraded my **ROM from cm12 to cm13**. And then, I was not able to decrypt the data with ES file explorer, after the OS update. **I know the key** used for encryption. Is it possible to decrypt the data manually? I thought it was not possible, but then i saw this post How to decrypt Adopted Storage? And now i believe there is a solution for my problem too.