With the free trial version of Amazon Video Downloader, you can only convert the first 3 minutes of each video. If you want to convert the whole video, you need to get the software registered for further usage.
No. Using DumpMedia Amazon Video Downloader, log into your Amazon account in the web browser that appears, and then search for videos on Prime Video the same way you would in a browser like Chrome or Firefox.
Go to the license retrieval page: https://www.dumpmedia.com/support/license-retrieval/
Go to the refund policy page: https://www.dumpmedia.com/refund-policy/.
Go to this guide.