First, do you have the required 64bit computer and operating system?
Second, WHY can't you install... what error message do you receive?
Please read https://forums.adobe.com/thread/1499014
-try some steps such as changing browsers and turning off your firewall
-also flush your browser cache so you are starting with a fresh browser
A chat session where an agent may remotely look inside your computer may help
Creative Cloud chat support (all Creative Cloud customer service issues)