How To upgrade from Windows 8 Consumer Preview to Windows 8 Release Preview

 
Step 1.Put the Windows 8 Release Preview DVD and Double click on CD drive From your Windows 8 Consumer Preview , don't need to boot the Windows 8 Release Preview DVD
Step 2.You will get In Dialog box and click on continue to install
Step 3.Follow the step like other installation.

Now your Windows 8 Release Preview is installed in C drive and the whole file of Windows 8 Consumer Preview is in Windows.old folder.