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You need to create a Visual Studio Solution that deploys the Ajax Control Toolkit assembles to the GAC. Yes, you can still use the AjaxControlToolkit with SharePoint 2013 on-premises


You have to install that tool kit into the new farm. That is 3rd party toolkit which is not backed up using the sharepoint backup method. Please install that and then test your web application. I think Ajax control toolkit is a codeplex solution

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