I tried an older version of LibreElec which was running python 2.xxxx and the argonremote.zip addon worked fine, so its definately a case of them needing to bring their addon up to date to support python 3.xxxxx
I have purchased the Argon remote to go with my Argon M2 with a Pi 4. I have LibreElec installed but can't get your argononeremote.zip addon to install.
I keep getting xbmx python dependency 2.25 could not be satisfied. I have tried clean installs of both 9 and 10 of LibreElec, but get the same message. I'm getting no response from Argon and wondered if anyone else has seen this problem. ?