I'm currently using an ancient (2007) iMac running 10.7.5. I'm using 1Password 3.8.22 on that iMac. Just purchased a MacBook Air running OS10.11.2 - but I haven't yet migrated my date from old iMac to Air because I want to make sure I have my 1Password ducks in a row before I do.
So, do I have to upgrade to 1Password 5 to use it on my new MacBook Air? If so, do I do that upgrade on the old iMac before migrating data, or migrate the old 1Password 3.8.22 and then upgrade once it's on the new Mac? I should also probably mention that I am running the iOS versions on both my iPhone (a 6S running iOS 9.2) and my iPad mini (also running iOS 9.2) and it would be really helpful to have all devices sync over iCloud.