Installing Cycling Manager 4 error

"The installer you are trying to use is corrupted or incomplete.
This could be the result of a damaged disk, a failed download
or a virus.

You may want to contact the author of this installer to obtain
a new copy.

It may be possible to skip this check using the /NCRC
command line switch
(NOT RECOMMENDED)."

How can i solve this? i buy the cd and i want to install