It's important to clarify the licensing status:

Because version 10.5.3700.0 is tied to Visual Studio 2008, it relies on specific legacy environments. Framework Compatibility Targets .NET Framework 2.0, 3.0, and 3.5.

Unofficial download mirrors often bundle installers with "potentially unwanted programs" (PUPs), adware, or malware.

The version string 10.5.3700.0 specifically identifies the assemblies and runtime environment for this release. If a compiled .NET application references this exact version in its dependencies, the application will fail to launch or throw a TypeInitializationException or FileNotFoundException if the corresponding runtime is missing on the host computer. The Legal and Safe Way to Download the Runtime

This guide provides information on obtaining and installing the Crystal Reports 10.5.3700.0 runtime engine, commonly used for displaying reports created in SAP Crystal Reports within .NET applications.

Example C# code:

Crystal Reports 10.5 is commercial software that was never released as freeware or open source. A “free download” in the legal sense does not exist for this specific version.

The full designer was included with Visual Studio 2008 Professional and higher; users with a valid VS 2008 license already own this version.

For legacy development, Crystal Reports 10.5 offered several robust features that made it a staple for .NET developers in the late 2000s:

10.5.3700.0 (often associated with Visual Studio 2008 / Crystal Reports 2008).

: This version was integrated specifically with Visual Studio 2008.

You are moving an old app to a 64-bit environment (like Windows 10 or 11) where the older 32-bit runtimes might be missing or misconfigured. How to Get Crystal Reports 10.5.3700.0 Legally