I have a mid 2007 mac running as a simple sync client running OS 10 El Captain. My 27" iMac runs sierra and acts as the simple hub. Since my mid 2007 iMac cannot upgrade beyond OS 10, can I still update to Simple Hub 5 on the 27" iMac and cannot my mid 2007 iMac as Simple Sync version 4.5? Or do all devices need to run in the same version?
Or can I continue running simple hub 4.5 and use simple home version 5? I am trying to avoid buying a new iMac while running version 5 on my phone. I also have an iPad 4 that must run v 4.5. Can v 4.5 connect simple hub v5?