When you attempt to register Quicken you may receive the following message:
Could not connect with Quicken.com. Please check your internet connection using a browser. If your connection is good, Quicken.com may be unavailable at this time. Please try again later.
Regardless of the error above, Quicken will continue to be able to download from your financial institutions, as well as download quotes, etc for your investments. When prompted for registration, simply click Register Later, and continue using the product.