The free video downloader works on both Windows and Mac versions. When you launch it, you will find its interface is very exquisite and without any ads. It offers you a free trial, you can try it before upgrading the premium version. To download and backup a YouTube channel, all you all you need is a good internet connection, a computer, and sufficient storage space. The steps are as follows:
Another workaround: Go back to the desktop and try AnyTrans ($39.99 for a single computer), a file manager for iOS devices that has an integrated downloader supporting 900 sites, including YouTube and Facebook. It'll transfer the videos to the iPhone for you over the USB cable. Even if you don't pay for AnyTrans, the download option remains and is free forever.

The same as you do to download any other videos. You just need to choose the 1080p or 4k format in the video result section, sometimes it is in the "video only" section that without sound, then you have to download the audio file (M4A) in the same result section, then you can load the video file and audio files together on your computer using the video playing software, such as VLC. You also can combine the video and audio files by using ffmpeg. Some youtube video does not have HD format originally, in such case, you definitely can not download any HD format video.

If you are looking for a free online video downloader which supports downloading any video online from any site using URL, you definitely can not miss VidPaw Online Video Downloader. VidPaw is able to convert videos from YouTube, Vimeo, Instagram, Facebook and so on to many formats like MP4 in high quality. No software is needed and easy to use on both Windows and Mac.

If you want to download as videos itself, you can use other free tools like Free Youtube Download to download all videos with a single click. Please be careful while installing this tool as it optionally installs a browser toolbar and modifies search preferences. So please make sure you read and uncheck the optional checkboxes while installing to avoid surprises in your browser. 
That said, with Android it is possible to install apps without going through Google. The latest is InsTube – Free Video and Music Downloader just for Android—you can only get it at InsTube's site. You download the APK (Android application package) file to sideload on an Android device. Find it in your device's downloads and click it to install. (You may have to go into your security settings and enable "Unknown sources.") There is a similar side-load app from YTD.
VidPaw offers up the usual features but on a relatively spartan interface. Though it shows how YouTube might someday crack down on these things—VidPaw's own tutorial video, hosted on YouTube, was "no longer available because the YouTube account associated with this video has been terminated." For now, however, the site works with 1,000+ other sites. It doesn't offer video/audio combo downloads larger than 720p MP4s; you can get the video alone as a 2160p WebM format if you desire.

The same as you do to download any other videos. You just need to choose the 1080p or 4k format in the video result section, sometimes it is in the "video only" section that without sound, then you have to download the audio file (M4A) in the same result section, then you can load the video file and audio files together on your computer using the video playing software, such as VLC. You also can combine the video and audio files by using ffmpeg. Some youtube video does not have HD format originally, in such case, you definitely can not download any HD format video.
You’ll find fresh and engaging popular videos of a very good quality that are easily downloadable with Catch.Tube from many websites throughout the network. The downloading process is so easy and can be performed in a few clicks. To make it even easier to use the website, we created an extension for the browser, which allows you to go to page download when viewing the video. Video downloaders can be found in Chrome Web Store and it is totally free. Just add it to your browser, and you will be able to save your favorite videos from popular services.
Original quality, without re-encoding. Download HD video of 1080P, 26K aK, 4K, nd 8K. Support most poplular audio or video websites including Youtube, Twitter, Vimeo, Facebook, Dailymotion, SoundCloud, Instagram, Liveleak, Break, Imgur, TED, CNN, Mashable, 1TV, reddit, IMDb, ESPN, Flickr, Bandcamp, 9gag, VK.com, Izlesene, TV.com, Tiktok, Odnoklassniki, Izlesene, Udemy, ...
Step 3. Next, the program will start parsing the link. If the number of videos in this channel or playlist is more than one hundred, the software will automatically download all videos (in the highest quality by default) after parsing; if there are less than one hundred videos, a window will pop up. At this time, you can select video resolution, whether to download subtitles and video cover, or convert all videos to MP3 audio, etc. After confirming, press the download button.
Step 3: Choose your targeted video format from the top right corner. There are a lot of formats available. Including MP4, AVI, MKV, and MOV. After this, click on the conversion icon on the right of the chosen file. If you have to convert all the videos in the chosen list, simply choose the “Convert All” option on the bottom right of the main window.
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