After downloading the Lion installer, it won't install on my 1 TB Snow Leopard boot disk. Why?

The disk has been verified, has shown no other problems and is up to date. Of the other volumes available in my system, only another (much smaller) with Snow Leopard shows as possible for the installation. The message for the disk I want to use is "This disk cannot be used to boot your computer". Computer is early 2009 MacPro with plenty of memory, disc to be used has 500 GB free. I have previously done a successfuil download of the installer, then a successful installation on another small volume, which is now erased, so I don't think there is a download problem. This installation was over Snow Leopard, which is what it now won't do on another volume.

Take a look at:
OS X Lion: Installer reports "This disk cannot be used to start up your computer"
http://support.apple.com/kb/TS3926

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Someone meet the problem, I am not abble install mac OS 10.6 snow leopard on intel based machine, (intel core 2 duo, 2,8 ghz, 4GB RAM, 320 GB HDD, OSX 10.5.8) system every time wrote "OS X snow leopard cannot be install on this machine" please help, Majo

omeone meet the problem, I am not abble install mac OS 10.6 snow leopard on intel based machine, (intel core 2 duo, 2,8 ghz, 4GB RAM, 320 GB HDD, OSX 10.5.8) system every time wrote "OS X snow leopard cannot be install on this machine" please help, Majo

It is retail disk, i bought it in apple store. I also resetter PRRAM and SMC and checked disk. I also tried clean installation and upgrade, nothing works, after run installation program after few seconds wrote: OS X Snow Leopard cannot be install on this machine :-(
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Where can I download the Lion installer?

Hi,
I purchased Lion when it was released and installed on one machine. I now have a new machine that I want to update to Lion but when I go to the App Store it just tells me that Lion is no longer available in the UK store.
Where and how can I find the Lion installer download? I can't put Mountain Lion on becuase the machine is not 64bit.
Cheers
James

QuickTimeKirk wrote:
The installer is found in the Applications folder once the download is complete. It's gone after its first running.
Those are facts.
Right but he can still download it from the Mac App Store.
Which is what he asked.
QUOTE:
Where and how can I find the Lion installer download?
END QUOTE:
Not where is it on my computer.
Your post leads him to believe it is No Longer available to him in any way. Which is completely WRONG.
So as I stated before do some research before posting Misinformation.
Thanks.
PS
Or don't reply to questions you don't know the answer to.
Thanks again.

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Hi,
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