After upgrading to Telerki testing framework 2018.3.1004.5 DownloadDialogsHandler doesn't handles save file dialog correctly in Internet Explorer 11 (Windows 10 x64).
Download file popup info appears, but browser's save dialog remains closed.
But when you open browser dialog manually (selecting "Save as" with mouse) DownloadDialogsHandler starts typing saving path.
Previous version of Telerki testing framework 2018.1.0418.2 works fine.
Browser was configured according recommendations https://docs.telerik.com/teststudio/getting-started/configure-your-browser/internet-explorer