OK, now I know what I'm talking about
The Orange gear pack (that's what you have bought) was released some time, when AmpliTube 4 ("AT4") was current. And, yes the AmpliTube Orange web page does state " Intel® Core™ 2 Duo, 2 GB of RAM (4 GB suggested), Mac OS X 10.7 or later.
The IKPM does not include AT4 so forget that for the moment. Instead try this:
-- go to your User Area / My Products and scroll down to AmpliTube Orange,
-- you should see that it says "v4.10.0 Release Notes"
-- click on "Past Releases"
-- you should see this:
-- download the OSX edition (450MB, as it has all the AT4 gear in it, ready for for you to Try)
-- UnZip it, there is a general Installation and Authorization Manual.pdf included
-- run the AT4 installer (I think that it will also try to install the Authorization Manager (but the one you have downloaded may be more recent) and the old Custom Shop. You may need that, I think, to Try other gear in AT4, but maybe the new Custom Shop will let you do that.
-- Once the Authorization Manager program is installed, run it and Authorize AmpliTube Orange using the Serial Number in your "My Products" area.
Then you should be able to run AT4, configure it audio/MIDI and load the gear. Or use the AT4 plug-in in a DAW.
Let us know how it goes.