# Examine the GAC and remove old assemblies

| Product Version                | Product                  | Author                                                             |
| ------------------------------ | ------------------------ | ------------------------------------------------------------------ |
| 2019.1.117 (.NET 4.0 or later) | RadControls for WinForms | [Dimitar](https://www.telerik.com/blogs/author/dimitar-karamfilov) |

## Description

You want to examine the GAC in order to check if the Telerik UI for WinForms are installed or perhaps more that one version exists.

## Solution

Open the .NET 4.0 GAC folder in the explorer. The GAC is located in the following folder: **C:\Windows\Microsoft.NET\assembly\GAC_MSIL**. Search for the Telerik assemblies.

![radcontrols-examine-the-gac001](https://www.telerik.com/products/winforms/documentation/assets/196c989eb35602256471ecbdbf28d401/radcontrols-examine-the-gac001.png)

That is all, you can remove the old assemblies directly from the search results.