brand new iMac fails to install software correctly
I just purchased a brand-new iMac (27-in 5K, upgraded to i7 Core, 256 flash drive; only 8 GB RAM but ordering 16 GB more RAM from macsales.com) and it arrived here a few days ago.
When I first started up, there were a handful of software updates I needed -- including an update to El Capitan with an iTunes update. All of my attempts at downloading and installing this software failed (it would download completely and then nothing would happen... it would just ask me to update the app again), so I contacted Apple Support and they had me download and install the update from a web link. Okay. That *kind of* worked. El Capitan is now updated to 10.11.3. But my iTunes still won't update. When I go to updates in the App Store, it says BOTH that I need to update iTunes to 12.3.2 AND that I updated to iTunes 12.3.2 in my "recent updates." My actual iTunes app is still 12.2.2.25.
1) Why won't iTunes 12.3.2 install? I can download it over and over and nothing ever installs. Restarts/shut downs are of no help.
2) And why is this happening to my BRAND SPANKING NEW iMac?! I spent waaaay to much money for a glitchy computer. I have waited 9 years to upgrade from my old macbook... and this is disappointing. I am half-tempted to return this computer because I'm afraid something isn't working right and don't want to be stuck with it. Apple won't explain to me why this is happening.
Thanks for any insight you all can give!
iMac (Retina 5K, 27-inch, Late 2015), OS X El Capitan (10.11.3)