C7 with 2.3.7.145.
File (link) in this post worked: Shelly Device Handlers for Hubitat - #540 by dmitry.rozovik
However, there was no 'success of import' message of any kind. It just sat there for about 5 minutes until I hit cancel on the import... It then refreshed the screen to show a the drivers were imported as a bundle.
There is no loggin whatsoever in the log files so agree with @dmitry.rozovik that troubleshooting is hard.
