If you are connected on self-managed or home network, then see the steps listed in Sign-in, activation, or connection errors | CS5.5 and later.
If you are on a managed network, or need information on how to configure your software/hardware firewall, then see the Firewall configuration section of this document.
If you have confirmed that you are not facing a configuration or software error, then you could be facing a quality-of-service issue when downloading large files. Try an alternate Internet connection.
- Use a wired connection instead of a wireless connection
- Use a different Ethernet cable and port
- Download using a different Internet service provider