Hi,
I would think there are some OutSystems tables in the System espace that could be queried, I never did try:
Not sure why you want it but it is to use that informatio to force the end-user to update the application on their device manually, then there is already a forge web application that can help you with that:
https://www.outsystems.com/forge/component-overview/3493/mobile-force-install-manager
Regards,
Daniel