Please uninstall Creative cloud desktop:http://helpx.adobe.com/creative-suite/kb/cs5-cleaner-tool-installation-problems.html, install again and try to download/install apps.
Additionally you ay refer the article:
If you problem is still unresolved then you may try the direct download:http://prodesigntools.com/adobe-cc-direct-download-links.html.
Note:Kindly follow the very important instructions before download.
Regards,
Rajshree