I'm running 10.11 El Cap with 1Password v6 on my laptop and 10.9.5 with 1Password v4 on my desktop.
Given that v6 doesn't run on my 10.9.5 machine, is there any way for me to sync? When one updates a Mac to version 10.11 it is hard to run the Adobe Suite which I paid for, but on 10.11 Adobe is trying to force the subscription model (cost prohibitive for software I run maybe once a month). So I'd like to run 10.9 on my desktop for the foreseeable future. I realize that is not your problem, but tying 1Password upgrades to OS version leads to problems like this for consumers -- I hope you realize this! Apple's constant upgrade schemes, even though they are "free" are not always as "free" as they appear to be.
This is another question, but why does 1Password v4 give me the explicit path of my vault, but v6 does not? This is very frustrating! It seems like v6 is actually less user friendly in this regard than v4. Why did you make that change? I can't even tell for sure I'm saving the vault on Dropbox (which if not the case is scary because what if my hard drive fails?)