The rest of my team are already on the Team Version on their Macs. Am I able to join them using my Windows 1password version via Dropbox? How?
@Apreel: 1Password Teams and local Dropbox vaults are completely separate. You can access both using the 1Password for Windows 10 beta app though.
Alternatively if there are particular items they need to share with you so you can access them using the 1Password for Windows desktop app, they can create a separate vault locally in 1Password for Mac (Preferences > Personal vaults) and share it via Dropbox.
I hope this helps. Let me know if you have any other questions!