When I researched the commercial version, the only difference I could find was the enclosure it came in. It was available long before version 4.0b.
From the 2013/2014 catalog:
OmniPro II Commercial Controller 20A00-5
OmniPro II controller with commercial attack–proof enclosure, lock set with two keys, RJ31X
cord and jack, manuals. Available in English.