How can I tell the app store to ignore my external hard drive?

I have a macbook pro, that was running 10.8..  I wanted to upgrade to Yosemite, but was very afraid I would regret it, so I got an external hard drive, made a bootable clone, and then installed yosemite onto that, upgraded XCode, etc-- made sure everything would actually work..  After I saw everything was relatively good and painless, I then went to install Yosemite on my main computer..
Whoops?  Yosemite installer is gone?  It self deletes?  That is really annoying since it's a 5.8gb download...  Anyway, I re-download it, format my MBP hard drive and install from scratch.
I then boot from my MBP-- and go to the app store to install XCode, and---  it just has "OPEN" as an option, not install..  When I click OPEN, it's opening it off my external hard drive.  WHAT?
So I unmount my external hard drive..  Click install..  remount my external hard drive, it goes along downloading the multi-gigabyte XCode file...  I continue copying the various needed files from my bootable clone to my MBP...  Two hours later, the download finishes...  Guess what?  No XCode in my Applications.
Apparently when I remounted my external drive, it decided "I already have XCode!  no need for this!", and discarded the download?????
...  Anyway, needless to say, this is ridiculously annoying.  Is there a way to tell the app store to NOT look at anything except my internal HD?

Check the date & version of the external Xcode. If that is current drag it to the Apps folder, eject the external & run Xcode. It should update if it has any available.
I don't know what would have caused it to abort or remove the download. It's possible it installed into your user folder, check for the Applications folder in there.
Does the store list it as installed with & without the external connected?

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