What is the operating system of your computer?
This kind of error occurs when, for whatever reason, Windows can't access/verify a critical installation file. Are you running antivirus, or are you behind a firewall? If so, temporarily disable them and try the installation again. Make sure you're using a stable internet connection.
Although it says "Windows 10" in the title, you may also want to look at this discussion thread: Creative Cloud Error 204 Windows 10. Ignore the correct answer, which addresses Mac. Instead, scroll down to see the discussion on resolving Error 204 for Windows.
Let us know if that helps.