Currently Being ModeratedAug 3, 2012 5:10 AM (in response to Pablo Poch)
Go to the App Store and re download it. You won't be charged again. The App Store (Mac not iTunes) can be accessed from your Apple menu, or the App Store icon in your Dock, or your Applications folder.
How to re download apps from the Mac App Store:
Open the App Store. From the menu bar click Store > Sign In
Click Purchases from the top of the App Store window.
Select which apps you want to re download. Then right or control click where you see Installed then click Install.
Make sure and use the same Apple ID used for the original purchase.
Due to an unrecoverable error on the data structure of the hard disc with Mac OS X Lion
If need to repair the startup disk or reinstall the OS X running Lion, don't use your Snow Leopard install discs. Use OS X Lion: About Lion Recovery
You can restore from a Time Machine backup using Lion Recovery.
Currently Being ModeratedAug 3, 2012 7:23 AM (in response to Carolyn Samit)
Carolyn, thanks for your reply. The problem now is that after I installed OS X Snow Leopard on my MBP's hard disc and I can't go to Mac App Store to reinstall Lion because in Snow Leopard I don't see it in the Apple menu. The App Store icon in the Dock appears as a generic icon (paper, pen, ruler). On the other hand, now I can't use Lion Recovery, as I had to erase the hard disc prior to install OS X Snow Leopard.
My security copy was made last month when I had OS X Lion in my MBP, in an external FW hard disc.
So, what should I do to from this point to install again Lion if I can't go to Mac App Store from Snow Leopard?
I have updated the software with Apple's menu Software Update.
Thank you again!