Xcode Install Assistant can't be installed on Macintosh HD because Mac OS X version 10.7 or later is required.

I am a new user on a mac. I was given a mac to use for work and I need to install Ruby, Ruby on Rails. The Ruby install instructions said to install Xcode first.
The mac os x is 10.6.8. I had a problem trying to install xcode because it said the operatin system version was not compatible .. Then I found xcode version 4.2 but it then said "Xcode Install Assistant can't be installed on Macintosh HD because Mac OS X version 10.7 or later is required."

The message kind of says it all. It needs a more current version of the OS to install. Mavericks is free if your machine meets the specs for it.

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    I found this (see below) it looks like your @Léonie solution is the answer to the problem.
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    BR
    Ann
    ----solution to the problem START:
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    Re: How do I reinstall an older version of Aperture from the App Store?in response to léonie | This solved my question
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