I have a license for Omnifocus v3.9 on a home Mac which runs on Mac OS 10.14.
At the office I use an 2011 iMac that can only use OS 10.13.6, which will not run Omnifocus 3.9
So, my tasks/projects/etc in Omnifocus 3.9 cannot be synced with the database in version 3.6.4.
This breakdown in cloud syncing is a real problem. What are my options?