Do you have a laptop or iMac? How old is it and which version of macOS it runs?
Did you try to install Electrum on another computer?
Does the website
wallet.trezor.io works with your Trezor?
I have a Macbook Pro, from 2012 and runs El Capitan.
I did try Electrum on my Win10 PC as well but didn't work. The website wallet works fine, as my main wallet is there and has never had any problem, it's just this specific wallet that won't work