An update for the App Portal Web Extensions is now live and available for download in the Product and License Center (must be logged in with an account that has access to your corporate entitlements). You’ll find the updated Web Extensions installer under both the App Portal 2020 R1 release and the App Broker 2020 R1 release folders.
This is version 3.0 and features support for the Chromium Edge browser. The following customer issues are also addressed as part of this release:
IOJ-2111192
Standard users cannot access Web Extensions.
IOJ-2102291
Web Extension support for Microsoft Edge (Chromium based) browser.
I believe step 4 under silent installations (with the /x parameter) is supposed to say "uninstall" rather than install, but I haven't tried it, so can't say for sure.