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.
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.

Before we continue, note that policies for the many video Web sites vary, so review those policies and move forward at your own risk. Distributing copyrighted material without authorization is illegal in the United States and many other countries. CBS Interactive does not encourage or condone the illegal duplication or distribution of copyrighted content. Before copying or distributing any content online, make sure you have the legal right to do so.
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.

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.
This is the most basic and official method to download Hotstar videos and movies. Hotstar itself provides you with the links to download some of its content. In order to download it, first install the Hotstar app on your mobile. Open the video and check if it is available for download. If it is, you will see a download icon similar to the one in the image below:
This rule, to be carried out this month, applies to all the YouTubers, regardless of their location or their content (even if it is directed towards a mature audience). This sudden declaration has caused quite a big conundrum in the virtual world. According to the rule, YouTube can demonetise the content of YouTubers who fail to follow it and might even get fined.
The next page will show a list of all Google products associated with your account whose data can be backed up. All of them will be selected by default, so make sure to unselect all and select only youtube. An easy way would be to untick the "Select All" button at the top which will unselect all items. Then scroll down and check the "YouTube" option.
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.
When it’s time to get started, you have to decide whether you want the free version or the pro version that offers a few extra features. From there, you put the URL for the YouTube video or channel that you want to download directly into the link box and select the resolution that you want. You get to pick the outputs, the place to save the information, the subtitle languages and all of the other important features and then you click the button to download. From there, you’re going to be ready to start listening and watching your favorite shows. 
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