@jim_
Not sure how your insteon support became unchecked. It's possible that you may have accidentally clicked it. At least you're back in business without having to buy a PLM
What are your firmware and UI versions?
As @Brian H mentioned, a factory reset on your PLM erased all it's data. What you needed to do was a "Restore PLM" assuming you have a viable and current backup.
After you get everything working be sure to do both an ISY backup and a Zwave backup
Here's the restore PLM info:
Click on the Battery icon at the top. This will prevent EISY from trying
to update programming on your RF devices which are probably in sleep
mode
Click on the Restore Modem (PLM) menu option
In case EISY cannot communicate (or decides not to if it’s an RF device
during the process, you will have a series of nodes with green 1011 icons in
the device tree. For each one of those nodes:
If an RF device, ensure that the device is in Programming mode (awake)
Right mouse click | Write pending updates
If the above procedure fails on many of your devices, it's highly recommended that you
follow the instructions for Restore Devices.