Historical facts:

• The first official release OM Pack 2.0.0 was the combination:
• OM  2.1.1
• JME 2.2.0
• JMT 2.0.0

The theme is the example of tons of workarounds for version 2.2, in meantime, some of them became part of the core, not to mention a lot of fixes and enhancement of the core itself. 

The direct update could be complicated because during the time there are:

• JME 2.3.7
• JMT 2.1.7
• the official release of core 2.3.0
• coming soon new core version 2.3.1 

So first step is to fix the theme for the official release 2.3.0 version (if it is needed) 

•  I installed 2.0.0 pack on official 2.3.0 (don't forget to install featurebox and gallery plugins like me)
• no visible issues, everything works

The next step is to fix the theme for the latest developer version 2.3.1 

• installed 2.0.0 pack on latest 2.3.1. 
• the only visible issue is the navbar search box.  Because this can happen with other theme, I wrote what to do. The fix is very simple. 

So the theme is working, after the 2.3.1 release, there could be the fixed version 2.2 released.