Hi Peter - We had already applied the download key in the settings prior to making the forum post. Just for good measure, I've tried again to clear all cache - browser, Joomla, and updates. But the same AMM update is still being reported.
The website was a Joomla 3.10.11 site that we recently updated to J4. AMM was already installed prior to the Joomla update.
After update we had the error with the regular labs extension manager where we had to manually remove the plugin and library folders and then reinstall.
So, I wonder if the AMM issue with the free version update trying to replace the pro version is related the update issues.
I've now uninstalled AMM from the extension manager and then reinstalled it from the extension manager. The free version update is now gone.