After not using Intel XDK for a year. I just noticed that they dropped support for this tool in early 2018 and removed all the keystores stored in their system.

Now I'm unable to update my android app because I don't have the key anymore.

And now soon google play will remove my app due to security issue on certain module.

I should've kept the keystore myself...
Oh well mistakes were made and lessons are learned the hard way.

Does anyone have any suggestion to retrieve a keystore file?