Need to upload extensions but can't find encryption data manager

[CC-Don]

I have bought and downloaded several extensions but get stuck on the encryption key requirement. Online it says there's a data encryption manager in the extentions but I can't find it. You help woild be very much appraciated

[Basara]

The Encryption Data Manager is a built-in extension in AbanteCart. You can find it under:
Extensions > All Extensions in your admin panel.

If, for some reason it was removed or is missing, you can download the extension files directly from GitHub and place them under the /extensions directory of your installation: Encryption Data Manager on GitHub

Important: Before setting up or changing your encryption key, make sure to back up your database using your hosting control panel tools. Once certain data is encrypted, it will not be accessible if the encryption key is lost.

[CC-Don]

How do you get an encryption key? Can it be anything you dream up or is there one generated somehow?

[CC-Don]

I'm gaining an understanding of this so simply ignore my question as I pursue the matter further.