I've been using this add-on since at least 2015 or earlier. It's easily worth it to get the pro version with a donation. I am able to download YouTube videos in 1080P to watch later offline and even save a 256kbps MP3 of obscure music without any troubles. Anytime there are major changes to YouTube sometimes this can make troubles for any video downloader app but this developer is committed to extended support for updating/fixing the problems. If you have technical troubles yourself, the developer is prompt with responding within a reasonable time and helping the best they can to get things working again. Just have a little patience if you have troubles and all shall be soon resolved. Support the developer cause it's not easy keeping this thing on-going alone. Much appreciated! Hope the developer keeps this going for a long time to come! Thanks!