Your installation of Easy Youtube Video Downloader software is now updated to latest v 16.5 (Updated 01-JUNE-2020) fixing failing downloads of lower qualities, Also, v 16.5 brings facility to add your PRO account email address in the "Addon->Settings" options to enhance privacy (no cookies anymore) - "NOTE : YOUR PAYMENT EMAIL-ID IS YOUR PRO KEY". Do share your feedback and BUGS if any using the links in dropdown menu. Once again your favourite video download addon is one of the very first (probably first) to fix the new Youtube code and push an update at the earliest to the users, we need your support to provide faster fixes and always being ahead in the game.
This all is a "single man job" and I am the only one manning everything from coding, publishing, website, support and debugging. Developing and maintaining this free service needs efforts and investment - If you liked it kindly donate a small amount using the "Buy Us A Coffee" Button below to donate via Paypal (you can select amount). Also, note that you don't need a Paypal account to DONATE and complete the checkout. You can use Paypal to just process the payment using your existing credit/debit card and even via your bank account. (Read more here regarding Donating without Paypal account)
Rate and leave a positive review about the addon at my Mozilla listing here - https://addons.mozilla.org/en-US/firefox/addon/easy-youtube-video-download/