Macaroon is distributed as two addons, Macaroon and MacaroonProfiles. MacaroonProfiles is only needed is you decide to save profiles of Macaroon setups. MacaroonProfiles does not even load unless you go to the Profiles configuration menu or load a profile.
Once downloaded, simply unzip the file into your Interface\AddOns folder so that you see both addons in the file structure as
Make sure that you are fully exited out of WoW when you install new addons.
When you enter WoW after an initial install of Macaroon, you will not see any major difference on your screen save for a newly added minimap button on your minimap. Macaroon starts you off with a clean slate, letting you, the user, decide what you want out of Macaroon instead of me, Maul, deciding for you what you should have and where.