Hello Steve,

Here are the steps that you need to follow:

1. Remove any previously installed version of Windows Forms 2016.2 on the target machine
2. Copy the dlls from a good machine to a folder in the problematic machine (let’s say the folder is named “WinForms 16.2”)
3. Inside the “WinForms 16.2” folder create a txt file with the names of all assemblies each on a new line. For example, you create the file assemblyFiles.txt and inside it add the files in the following format:

Infragistics4.Documents.Core.v16.1.dll

Infragistics4.Documents.Excel.v16.1.dll

Infragistics4.Documents.IO.v16.1.dll

4. Open a Developer Command Prompt (installed with any version of Visual Studio) as an administrator
5. Navigate to the “WinForms 16.2” folder
6. Run the command “gacutil /il assemblyList.txt” (This should add all the assemblies from the assemblyList.txt to GAC)
7. Then to add the dlls to the VS toolbox, you can follow the steps described at https://ko.infragistics.com/help/winforms/introduction-adding-controls-to-the-toolbox. The easiest method will be to copy the dlls from your “WinForms 16.2” folder directly into the newly created tab in the toolbox.

Please let us know if you need any additional help.