Please click on the video's title on Kigo Amazon Video Downloader, the video will be automatically opened in a pop-up browser, then please check if the video can be played normally in the web browser. If it is a paid video, please purchase the video firstly.
If the video cannot be played, please try to switch to a different country/region in the Settings window.
Sometimes if the login expires, it will also appear 8001. Please try to click "settings" > log out and search the videos again. It will notice you to login again when searching.
If you have tried all the above but still get error 8001, please send all details of the problem and the latest log files to the support team via email firstname.lastname@example.org.