Camtasia 9 requires the Media Feature Pack to be installed with Windows N. Download the Media Feature Pack based on your operating system:
Windows 10, 8.1, 8
Download and install the Windows Media Feature Pack for your version of Windows from this Microsoft Support Article.
See this support article to determine which build of Windows 10 is installed.
Download and install the Windows Media Feature Pack for Windows 7 from this Microsoft Support Article.