[OPPA U5] Do I need separate licence from other openplant software?

I've got OPM, OPIM, OPPID, OPOM, OPSE U5 all up and running properly, except for OPPA U5, which is only running as a 7 days trial. Didn't think OPPA would need separate licence to run, or my impression was wrong? 

Best regards,

Tuan Le