Hi...
First thing to check is that you have installed the content in the Free Resources section of Content Manager.
If you have all the free resources, then is it possible you have moved your content files and folders around since you installed CC4? I ask because there are clearly missing files and the file path shown in the error box looks a bit unusual. Moving content after installation will lead to numerous problems so should be avoided.
Overall the easiest solution may be to uninstall CC4 (and iClone 8 if you have that too) and then reinstall again, this time making sure you choose the correct drive and file paths you want for your content. Then when you install any content packs they will be installed in the correct file paths and it should resolve the missing files problem.
Peter
Forum Administrator
www.reallusion.com