Here's a list of what you need to have for the mini and OMNI to work:
1-Pro Tools Ultimate software(standard PT does not recognize digilink hardware at all). Be sure you get the version of PT that works with the version of OSX
2-HDN Thunderbolt box with appropriate cables to connect to the Mini TB port.
3-Digilink license on your iLok(not a fan of cloud-based iLok licensing).
4-Mini-Digilink cable(connects the OMNI to the Native TB box)