docs: add Newtonsoft reference version issue resolution

Author: Marin Bratanov

installation/upgrading-instructions/upgrading-a-trial-to-a-developer-license-or-to-a-newer-version.md

@@ -159,6 +159,8 @@ There are several ways to **fix** the issue:
 
 * **Remove the Newtonsoft.Json.dll** file **from** the `Program Files\Microsoft SDKs\Windows Azure.NET SDK\v2.3\ref\` folder as suggested in [the workarounds in this item on Microsoft Connect](https://connect.microsoft.com/VisualStudio/feedback/details/850425/windows-azure-vs-tools-breaking-msbuild-for-web-projects).
 
+* According to client reports, in some cases [cleaning the ASP.NET Temporary Files and the .NET temporary files](https://weblogs.asp.net/psheriff/clean-up-after-visual-studio) resolves the problem as well.
+
 
 
 ### Could Not Load File or Assembly 'Telerik.Web.UI' After Upgrade