Instructions
Go to the preloadable content's download page and download the encrypted game files. Note the game's official release date. This date is located on the download or purchase page.
Locate the locked, encrypted files on the computer's hard drive. They will automatically unlock on the official release date. Double-click to decrypt the files once they have unlocked.
Wait for the compressed files to unpack when the decryption process is complete. Double-click on the unpacked install file to run the installer. Click the "Install" button to begin installation.
Wait for installation to complete, then double-click the game icon to play the game.