I love the idea of the TRANSITIONINSTALLMODE=3 command line parameter! Because this behind the scene removes the previous 32-bit versions of Reader and Acrobat while installing the new 64-bit unified app. Removing Acrobat usually is a pain because if any other Adobe processes are running, eg acrobat, AcroRd32, photoshop etc then those processes have to be terminated or the install fails.

However there appears to be a version check when using the parameter and so in the scenario where ARM is self updating the 32-bit app and installs say a latest optional update which is a higher version than the 64-bit unified app with the latest planned update, the install will fail with error "Setup has detected that you already have a more functional product installed"

Can Adobe software development PLEASE remove that version check and install the 64-bit unified app REGARDLESS of what the 32-bit App version is? Or at least can the check disregard the 32-bit app version if it's only one optional update version higher?