as far as I understood it, that was just my radical behaviour.
to update qorbiter, you uninstall it from your mobile device, reboot, perhaps delete the linuxmce-folder, if it still exist. download the fresh build and install it.
no need to muck around with the qorbiter device in webadmin.
You shouldnt need to remove it from your device. It should install over the existing version. No need to delete folders as the settings are now stored using and non user exposed settings system (the android settings system that your other apps use).
No need to delete existing qorbiter from your linuxmce install.
No need to delete the existing qorbiter from your android device
The qorbiter installation package (apk) that linuxmce releases has a different release key from the one in the Google Play store. This means it wont let you install from the webadmin and then try to update from google play, and vice versa. This is really a rare case but i thought i would mention it.