I need to install Mac OS on a USB external HD, but can't find the OS installer...

Hello,
I recently installed Yosemite on my Macbook Pro, but then I got an integrity issue on my system HD. I need to repair this HD.
But the recovery partition doesn't work (by the way, it's still OS 10.9, not 10.10...).
So I would like to install Yosemite (downloaded version) on an external HD. But I fail finding the location of the installer.
I just found a "OS X Yosemite.appdownload" package in the Application folder, but it's content (> show package contents) seems quite empty, even when I download Yosemite...
So, I would like to know:
- where is located the installation package?
- what I should do to keep it from being deleted?
Thanks a lot for any help...

When you originally downloaded the Yosemite installer it was sent to your Applications folder, it did it's thing and then deleted itself. In order to avoid that, you'd need to quit the installer before running it, copy it to a different location and then start it again to actually run the upgrade. So you'll have to download the Yosemite installer again to install it on an external.

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