I have tested the extension from your Download Section https://www.enpass.io/downloads/
If you download it for the edge browser you will send to this adresss.
https://microsoftedge.microsoft.com/addons/detail/enpass-extension-require/mliehcloacfoicbanjhhnlimealolgoi
It seems to be, the extension is to old. It does not work, the browser is not trusted if you want to enable the extension.
I downloadet the originial from the chrome store and this on works as it should.