I believe you round just run
to run it on the testnet. I don't think you need the petrkr-testnet fork of Electrum.
The error regarding the AES package means you don't have that python module installed. Running that install command would fix that.
Great!!! It was that simple. I didn't find this in documentation. I think the documentation needs an update.
Thanks for the answer, I don't know how this bitcoin.org works, is there anyway, I van accept or upvote your answer.