Did we check the folder specified in the first window from the exe? When running the .exe file it'll prompt you to enter a folder, the default along the lines of:
- C:\Users\<username>\Documents\ArcGIS 10.6\FullMotionVideo
On navigating to that folder there should be a few files including the .esriAddIn file that were extracted by the .exe.
If we've run the .exe and there are no files at the target output location, would suggest checking if you have an extraction utility installed, such as 7-Zip. You can download 7-Zip for free at http://www.7-zip.org/
If the exe has run with an extraction utility stored and there are still no output files in the output folder specified then I would suggest logging a case with technical support who may be able to further assist.
Note that you may also need to request the licence if you haven't already obtained it. My understanding is that it is available for those with active maintenance but you will need to request the licence to be assigned to your account. This won't be affecting the extract/install but is another step to be undertaken.