Update: I can get Ultraloop to run on the M+ but it’s definitely a hack job and not intended to work on the M+. CPU hit is like 60% but you can run it.
I followed these steps and these steps are transferable to a lot Reaktor Ensembles. Stay tuned
Do those steps and place the file under “User Content” on your SD-Card on the M+.
They will show up in your browser “User” area. When they show up half the work is done, but it´s not guaranteed they will make any sound or run at all. Also beware, as this stuff is not officially supported, tha the M+ could freeze / crash while you load your hacked stuff. Happened to me four times now, but more likely an user error on my side.
Have Fun.