Pretty straight-forward. It's an exe wrapped around an MSI. Note that Arrow will not upgrade a previous version of itself: they'll co-exist. So if you're upgrading you'll need to uninstall the previous version manually.
Install:
AroFullz.exe /S /v"/qn SERIALNUM=XXX-XXXXX"
Uninstall:
msiexe.exe /X{FF97B9E0-2221-4BBB-9560-5C21424F1248}
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