Sorry to hear the problem continues.
This problem could be associated with your TEMP directory which may have some conflicting files in there.
1. Type %Temp% in the Search Box on your Task Bar and click the %Temp% folder found in the search list.
2. This will take you to C:\Users\<YOUR PROFILE NAME>\AppData\Local\Temp.
3. Highlight and delete all the folders and files in the Temp folder (some may remain, this is normal).
4. Go to C:\Windows\Temp
5. Highlight and delete all the folders and files there.
6. Restart your computer and try to install CC3 again.
* NOTE: The Local\Temp folder is a hidden folder and so may not appear. To view hidden files and folders, do the following:
1. Open the Control Panel and select "Appearance & Personalization".
2. Click "Show Hidden File and Folders".
3. On the View tab, under Hidden files and folders, click Show hidden files and folders.
If you then still have problems, please contact Technical Support and they will be able to assist you further.
Peter
Forum Administrator
www.reallusion.com