Hi..Sorry to hear of your problems installing iClone4.
As the error message states it sounds like you have a corrupt installation file. I would try and download again and see if this solves your problem. You can login to your account and find the link to download again there. If this doesn't work then please contact Reallusion Support using the link below. They may be able to supply you with a different link to the installation files or advise you to the cause of the problem.
http://www.reallusion.com/CustomerSupport/User/QForm.aspx
Note: If you are trying to install the iClone EX version then there is an alternative download link HERE which you may like to try. For purchased versions of iClone please contact Support.