Before diving into the download process, it is vital to clarify what the "Runtime" actually is. Many developers confuse the Crystal Reports Designer with the Crystal Reports Runtime .
If you are searching for the you are likely preparing to deploy an application to a server or a client machine where the full Visual Studio IDE is not installed. This version (13.0.35) represents a pivotal update in the Crystal Reports for Visual Studio (CRfVS) lifecycle, offering stability and compatibility with newer Windows environments.
This is the safest and most legitimate method.