LR 4 for Mac not installing on external hard drive

I have a Mac LR2 installed in a external drive. I just upgraded to LR4 and want to install it in the same external drive and upgrade LR2, but it would allow me to install in the MacBook HD. If I install in the Mac HD would it create an issue with LR2?
Thanks

You don't have to do anything to the drive to make it Bootable. Other then installing OS X on it.
Boot your system from the Online Internet Recovery system, Hold down the Command+Option+r keys until you see a spinning globe in the center of the screen. It is best to have the system Wired to your Internet Router for this. Have the External drive connected to the system before you start it up
Once the system starts from over the internet use Disk Utiltiy to Partition the drive as One partition with a format of Mac Extended (Journaled).
Then once that is done exit DU and select Reinstall Mac OS X. Either Lion or Mt Lion will be downloaded from the internet, whichever originally came on your Mac, and when the download is finished the install willl start.
Oh and yes you need to point the install to the External drive. You do that before the download starts. Just follow the on screen instructions.

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