This specific version was never sold as a standalone "Free" tool for general consumers. It was included as a feature within the Visual Studio 2008 installation.
While the runtime was free to distribute with applications developed in VS 2008, the full designer required a Visual Studio license or a separate Crystal Reports designer license. How to Obtain Version 10.5.3700.0 Crystal Reports 10.5.3700.0 Free Download
Note: Ensure you are downloading from reputable sources to avoid malware. Download the appropriate MSI file. Run the .msi file as an administrator. This specific version was never sold as a