Decided this morning that I'd give Synapse another try after a few months without... YAHTZEE!!! Got it up and running without any kernel panic or errors thrown regarding other kernel extensions Here's how you do it: 1. Install Synpase 1.72.10 from the support page. (while it only mentions compatibility with macOS versions up to, and including, 10.12 - it's gravy) 2. Go ahead and unplug all Razer products from your laptop/desktop. 3. Install Razer Synapse and agree to restart. 4. HERE'S THE KEY: Synapse won't turnover by just opening the Razer Synapse.app, you need to open /Library/Application Support/Razer/RzUpdater 5. Synapse fires up and requests user login. From here.. pretty self-explanatory. 6. whatever you do DO NOT UPDATE SYNAPSE, you'll send your efforts swirling as it locks up at 50%.