Update.... So we discovered that most of our Clevertouch Plus displays are running Android 6.X and have the "unknown sources" option. However, one plus model with an older Android module is only running 5.X and does not have it nor the Clevertouch V-Series with 5.X. At the moment, we are assuming it is a version issue? For the plus model with Android 6.X you can install compatible APK's via USB or Clevertouch MDM.
So that leaves us looking for a solution for the V-Series models. Anyone had success?
Thanks,
Oscar V.