This article demonstrates how to load Arcade in Maschine:
Open up your Maschine project.
In the left-hand side Sound section, click (+) under 'Sound'.
Scroll down past the factory Instruments to the ‘Output’ section and select Arcade (AU or VST).
Double-click on the icon labeled ‘Arcade’ or click the arrow right next to 'Sound'.
Troubleshooting:
In Maschine, go to File > Preferences > Library
From there click "User" > "Add"
Add these locations if they are not present (you can skip this step if they are already there):
Windows:
C:\Program Files\VstpluginsmacOS:
Macintosh HD/Library/Audio/Plug-Ins/Components/
Macintosh HD/Library/Audio/Plug-Ins/VST/
Hit "Rescan" at the bottom of the window.