This is the only "verified" source. You should search the SAP Downloads section for "Crystal Reports Basic for Visual Studio 2008 Runtime." Note that you may need a (free) SAP account to access legacy service packs.
Occasionally, Microsoft’s older SDK repositories host these runtimes, though they frequently redirect to SAP. Installation Tips for Modern Systems crystal reports 105 37 download verified
Always run the .msi or .exe as an Administrator . This is the only "verified" source