Unless I am missing something major, I can't install Bridge.  When I try to install Bridge, I get the message that it is not compatible with my OS (Mac OS Sierra 10.12.6).  When I try to update the OS, I get a message that I cannot update the OS on this computer.  Please see attached screenshots.  I have a new computer in the works in the next few months.  I currently use LR and PS CC 2017 as I am unable to load a more current version.