Hi...
How much free hard drive space do you have? If you have too little free space this can cause errors like this.
So check how much free space you have on the C: drive and the drive you are installing CC4 onto if different. By default the C: drive will be used for your temporary files so even if you are installing to say the D: drive you will need plenty of free space on the C: drive as well.
Peter
Forum Administrator
www.reallusion.com