HI, after registering my Maschine MK3, I can't find Maschine 2 Software for running the Maschine 2.
You should find the software available to download from Native Access which you can download from here - https://www.native-instruments.com/en/support/downloads/
What version of MacOS are you running?
I updated Native Access but the Maschine 2 update doesn't show up. I'm trying to upgrade from 2.17.5
Did you meant 2.17.4?
Maschine 2 needs macOS 12 (Monterey) or higher since 2.17.5.