SQL Server Denali: CTP3 Insallation Error "The Data is invalid"

After donwloding SQL Server Denali from here, I thought, it will take only few mintues to install but unfortunatly it took 3 hours. I tried every thing but every time error was same “Data is invalid”

To install SQL Server Denali CTP 3 (at 32bit machine) you must have

1. Integrated_CT2776682.exe
2. SQLFULL_x86_ENU_Core.box
3. SQLFULL_x86_ENU_Install
4. SQLFULL_x86_ENU_Lang.box

For x64 name of files is same, just replace x86 with x64.

I found that “Data is invalid” error occurs when you have not downloaded “SQLFULL_x86_ENU_Core.box” properly. So I you are also facing same error, repeat your download process for only “SQLFULL_x86_ENU_Core.box” and re-execute SQLFULL_x86_ENU_Install.exe.