"You must manually add the controls to the Toolbox. Right-click the Toolbox, choose 'Choose Items...', click 'Browse', and navigate to: C:\Windows\Microsoft.NET\assembly\GAC_MSIL\CrystalDecisions.Windows.Forms\v4.0_13.0.4000.0__692fbea5521e1304\CrystalDecisions.Windows.Forms.dll"
You installed Crystal Reports before installing Visual Studio 2019 Workloads (e.g., .NET desktop development). Fix: Uninstall Crystal Reports → Repair Visual Studio 2019 (ensure ".NET desktop development" is checked) → Reboot → Reinstall Crystal Reports. download crystal reports for visual studio 2019
Here is the mistake most people make: They try to install the Crystal Reports engine before they have the necessary Visual Studio components ready. "You must manually add the controls to the Toolbox