Crystal Reports 10.5 was available in both 32-bit and 64-bit MSI redistributable packages. Installation Guide Crystal Reports, Developer for Visual Studio Downloads
This indicates a missing runtime.
If you are using Visual Studio, ensure that your project references these key DLLs: crystal report runtime 105 download 2021 64bit
Missing 64-bit database drivers (e.g., SQL Server Native Client 11.0 64-bit, Oracle 64-bit client). Solution: Install the corresponding 64-bit database drivers. The Crystal Reports runtime does not include them.
"Crystal Reports 2008 runtime redistributable 64-bit" or "CR2008_SP3_Redistribution". Important Components for Installation Crystal Reports 10
Search for .
Once finished, confirm that the assemblies (such as CrystalDecisions.CrystalReports.Engine.dll ) are present in the Global Assembly Cache (GAC) located at C:\Windows\assembly . Troubleshooting Common Issues 1. "Logon Failed" or Database Connection Errors Solution: Install the corresponding 64-bit database drivers
Ensure your application is actually compiled as x64 and not Any CPU or x86 .
If repair fails, uninstall completely, restart the computer, and then re‑install.