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I am on a mac as well...

ok so I am brand new to this, have a garmin oregon 450 and I want to put the MO topo map on it for a float trip coming up. I have basecamp, map install and map mgr. I download the map from here and then try to click on it and open with... map mgr.. it then say.. it found no unlocked maps., There are NO other things to click to unlock it like a lot of the forums say. I have benn round and round, reinstalled everything. Nothing works. been at it 2 hrs and am about to say screw it and take it back  and just use an app to track my miles on my phone if its this hard to use. can u help? thanks.