I have Snow leopard, 10.6.8 on my iMac, I just tried to install Lion from the App store, but during proces, the install stops after one minute saying: "software might be damaged". I downloaded the software again, same thing. What must I do to install Lion

I have Snow leopard, 10.6.8 on my iMac, I just tried to install Lion from the App store, but during proces, the install stops after one minute saying: "software might be damaged". I downloaded the software again, same thing. What must I do to install Lion? I have still 487GB free.

Quit all other programs and open Disk Utility
Select your "MacintoshHD" drive on the left and indented and click Erase > Erase Free Space > Zero and let it complete.
Also run First Aid > Repair Disk and permisisons.
If Repair disk gives a error, you have a bigger problem, if repair permisisons fixes and completes, even if it fixes the same thing twice if you click it again, it's ok. Apple just changed things.
You should be able to download the file sucessfully this time, if not, take it to another location with better/faster internet.
If not then run through this list
Step by Step to fix your Mac

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