I am on 10.13.66-6, but system will not upgrade to 10.13.66-9. I do have System Admin Pro.
Even though I have System Admin Pro, I followed the manual method here: http://wiki.freepbx.org/display/PPS/FreePBX-Distro-10.13.66
Once it bumped up from 10.13.66-6 to 7, I was able to use System Admin Pro to go from 7 to 10.13.66.9
How dangerous is it to jump like that? I’ve always run through all the levels one at a time.
System Admin Pro will still perform the intermediate upgrades between. Safe…supposedly even after it originally got stuck at 66-6. Just required a little coaxing. Lord knows why.