Remember that problem of using Chrome extensions from the Google Web Store? You're going to have an even bigger issue when you want to download from YouTube using an Android app from the Google Play store, where Google has an even tighter grip. (Nor can you actually download anything with your officially sanctioned YouTube apps. Unless you live in India.)
There are workarounds. One is using a free iOS file manager app like Documents by Readdle. Use the Safari browser to visit a YouTube video, and use the Share option to find Copy Link. Then go back to Documents, and use the built-in browser in the app to surf to a video download helper site like SaveFrom.net. Paste the link into the form (hold your finger down on it until you get "Paste" menu to pop up). The site will give you the links to download, and you can save the file to Documents. Hold down and drag the file up, until you're back on the main screen, then drag it to the Photos folder. You'll need to give Documents permission to access Photos the first time. You can then access the video like you would any video taken on the phone or tablet—in the Photos app.

If you mis-tag your videos for the wrong set of audience, the FTC could charge you with compliance issues, and later, even takedown your channel. Other disciplinary actions include the implementation of fines, which could go up to $42,000 for each violation. Even though the help-centre of YouTube claims that they will look into the financial status of the content creator before the fines are decided, it still could add up to a considerable amount. Many YouTube animators are currently in a dilemma, as their work is not directed at children, but cannot be tagged as “for adults” either.
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. 
There are lots of videos without audio formats available with DistillVideo. You just need to copy the URL of your preferred video, then paste the URL into the search box of Distill Video and press “Start” button. In the video section showed, there is "Video only", click "More" on the right side, select the format you like and right click the "Download" button, then click "Save link as..." to download the video without audio onto your computer. If you are using browsers of the smart phone or tablet, just Touch and hold the "Download" button, then click "Download link" to save the file to your device.
This URL video downloader makes video grabbing as easy as A-B-C. To download a video, all you need to do is to copy and paste the video link and wait for the app to analyze and grab the target video. Moreover, it allows you to download in different formats and qualities. Instead of downloading and then converting the video to your preferred format, now you can choose the requisite format before the downloading begins. All in all, this free web video downloader offers a neat and safe way to save online media for offline viewing!

You just install the downloaded software, and then you put the URL into the link and click to download. It’s that simple, and you’ll be able to get started listening and watching your favorite videos again in no time, and without having to get online again. That makes it great for when you’re traveling anywhere where you won’t have an internet connection for a long period of time. For those who haven’t used a YouTube channel downloader before, this one is going to make it super simple, and you’ll wonder why you haven’t done it before.

YouTube By Click is much more than the easiest YouTube Channels Downloader! You Can download YouTube playlists. Download from almost any video site including Vimeo, Dailymotion, Facebook and many more! It's very intuitive and easy to use! Supports downloading of private YouTube and Facebook Videos. YouTube By Click has no limitation, It supports all qualities, including HD and all formats. With YouTube By Click you can download video of any length, even very long videos. YouTube By Click is 100% free!

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