Otherwise a user can pass /NCRC on the command line and bypass the
CRC check, meaning they could use a corrupted installer. I can't think of
a reason why we'd want to allow the use of corrupted installers.
Specifies whether or not the installer will perform a CRC on itself before allowing an install. Note that if the user uses /NCRC on the command line when executing the installer, and you didn't specify 'force', the CRC will not occur, and the user will be allowed to install a (potentially) corrupted installer.