Totally free, 5KPlayer from DearMob is a media-playing utility that is a lot more than a downloader—but it's got a heck of a downloader integrated. Promising no viruses, ads, or plug-in requirements is a good start. It is, sadly, one of the few I tested that asks for a registration of your name and email—you have to do that to get the full download function across 300+ sites. You may still use it if you don't register; I didn't and was able to download 4K vids from YouTube.
When you copy a YouTube URL (even for a playlist), click in the WinX software to launch. You start with the "analyzer," which checks all the options. This tool also tried to default to the 1,920-by-1,080 version in MP4; I picked the 4K version (3,840 by 2,160 pixels) in WebM format, a subset of the MKV format—you can rename a .webm file to a .mkv and it'll work fine. In settings there are options to default to WebM at highest res. You can set up a number of videos to back up before you even click the download button. The 4K 575.4MB file took 1 minute and 39 seconds to download, more than double that of 4K Video Downloader.
With this online YouTube channel downloader, you have the ability to download the YouTube channel you want completely free, as long as it’s not copyrighted. This service provides downloads for what it considers ‘educational purposes.’ It does block any kind of content that has copyrighted material in it, which means you’re not going to have quite as many options for what you want to download, but you’re still going to have a lot of interesting things that you can listen to or watch. What’s really great is that it’s simple to use.
The Chrome Web Store—where you get Chrome browser extensions—is controlled by YouTube's owner Alphabet/Google. Even an extension ostensibly for this purpose—like the obviously named Video Downloader professional above—states right up front in its description, "The download of YouTube videos to hard drive is locked because of restrictions of the Chrome Store." In general with Chrome extensions, the download of any RTMP protocol video (protected videos) or streaming video isn't possible.
With this online YouTube channel downloader, you have the ability to download the YouTube channel you want completely free, as long as it’s not copyrighted. This service provides downloads for what it considers ‘educational purposes.’ It does block any kind of content that has copyrighted material in it, which means you’re not going to have quite as many options for what you want to download, but you’re still going to have a lot of interesting things that you can listen to or watch. What’s really great is that it’s simple to use.
Multi-lingual 4K Video Downloader (4KVD) is frequently updated and features clear download links on the program's website; no ad traps here. The software does what it advertises in a simple interface: grabs videos up to 8K in quality and downloads to plenty of formats. Just copy a YouTube URL and click the Paste Link button to get started. 4KVD will even grab subtitles, entire playlists, and all the videos in a channel to which you subscribe. The sites supported are limited to the big names like YouTube, Vimeo, Facebook, and a few others, but covers most of what you need.
Ororsoft Youtube TV is unique software which turns your PC to customizable internet TV, bringing the best of Youtube videos to your desktop. With the channel filter feature and other useful search options you can easily find the videos you look for and play them live or download to your hard drive. The intuitive interface makes this a perfect tool for both new and experienced users - you can initiate a batch download of selected videos or watch these in live mode without having to download. Features: Youtube TV - play youtube videos from your playlist with high quality. Get the playlist searching for best ranked videos matching typed keyword or compose it by manually choosing the films. All items can be played in full screen mode with auto advance feature. Flexible search - with options to search by categories or sort by view counts, ratings and publish date. You won't need to open your browser any more to find the videos you are interested in. Filter results by channel - Search only in your favorite channels, this feature will greatly increase the effectiveness of your searches. Download or play all the videos from your favorite channels. Use this feature to backup your content of your own channel on youtube. Favorite Channel Manager - maintain the collection of your favorite channels using the predefined list of best channels in youtube category. Easy view and Quick Select modes - two modes optimized for better comfort. In "Quick select" mode you can quickly add videos to the playlist. Switch to "Easy view" mode if you prefer to see the detailed information. Download Manager - Save all your preferred videos to your hard drive by a single click. Video conversion - automatically convert videos to MPG, AVI, MP3, MOV and many other video formats. Video Player - play your downloaded videos by a simple double click, without a need for special programs or codecs.

To protect your channel from COPPA, you can download all videos in the channel to your computer for backup or re-upload them to other platforms. Since online websites do not support batch downloading of videos, and most of them have suspicious and unsafe ads embedded, thus, it is better to use a safe and reliable tool like Jihosoft 4K Video Downloader. 
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