Put this file as /Library/Preferences/FeatureFlags/Domain/Ensemble.plist and reboot to (hopefully) turn on Universal Control on macOS 12

Ensemble.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<!-- not sure which one it is, so set both -->
	<key>Ensemble</key>
	<dict>
		<key>Enabled</key>
		<true/>
	</dict>
	<key>Enabled</key>
	<dict>
		<key>Enabled</key>
		<true/>
	</dict>
</dict>
</plist>

I faced the problem ( installed 21C5031d) too.
And, I just published how to solve and using "Universal Control" .

If it helps, send me some bitcoins from Tip Jar, thank you!

https://twitter.com/tkgshn/status/1461339717614862337?s=20

One of my machines is a 13 inch early 2015 modal. Which isn't supported. However Monterey 12.3 beta is up and running on it. Is there a simple way to make it available. I mean it doesn't make any sense the OS is running on the machine, but one native application refuses to work.

@newmediacrew ask khronokernel: https://twitter.com/khronokernel/status/1428407216931999749 it's possible to override the list of supported Macs, but you'd need to disable SIP and find a way to inject code into the Universal Control app somehow

@zhuowei this looks pretty difficult even for an full stack developer as myself... I'll wait a bit. Thank you for the information though.

@newmediacrew a different (likely easier) option is using OpenCore Legacy Patcher to enable it. The thing that does the job in the patcher is in acidanthera/FeatureUnlock and also provided by khronokernel. Also it doesn't require disabling SIP first I think. And here is a tutorial to make it even easier.

cc