If you're willing to do more about the offline YouTube videos, you can try the its advanced version - MacX Video Converter Pro. Comparing with MacX YouTube Downloader, It not only allows you to download YouTube SD/HD/4K videos on Mac, but also convert them to all general-purpose formats, and common devices profiles, edit the downloaded YouTube videos, record screen videos from both desktop and iPhone, or capture videos with webcam. Besides, if you have DVD sources, you can also take advantages of this program to rip DVD to any formats and devices, or make a backup of your DVD movies without any quality loss.
Refresh the page and try again. Sometimes it is better when no other applications or software are running. For example, close Word, Excel, etc., and/or anything else that you are not using at the moment, and make sure you are not connected to Skype, Facebook or your email while doing the video download so your computer is not "busy" running heavy apps or software.
However, even free, you can grab 4K video from YouTube with no problem. A 575.4MB file took over 10.5 minutes—no surprise with the speed restriction, but still agonizingly painful. There's an option to convert the file to MKV, AVI, or WMV as you download it. If you want a playlist, you can do them in a batch, but in my test TubeGet would only allow a max of 1080p HD even on the 8K video playlist.
MacX YouTube Downloader helps you out of the dilemma, letting you download YouTube videos (HD/4K) on Mac free, thus you can save and watch your favorite videos offline, even if you are thwarted by the lack of Wi-Fi, restrictive data plan or sudden video disappear from YouTube. The free YouTube video downloader for Mac has been highly awarded by big tech giants like CNET, receiving 3.5 stars. It stands out from the rest largely due to it's free, safe but powerful in downloading any kinds of online videos like 360 degree VR videos, 4K/8K UHD, 3D videos, HD videos, Blu ray movies, TV shows, music, etc in whateverformat (MP4, FLV, WebM, 3GP, etc.). Its user-friendly interface will guide you to grab videos from YouTube on Mac without consulting any tutorials or user guide, no matter you are an experienced user or a newbie.
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 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.
The web browser Safari can be served as a Safari YouTube downloader, which offers an easy way to download any HD 720P/1080P videos on YouTube as well as other web. And for a successful YouTube videos download on Mac OS X, please make sure you have the latest version of Safari. Follow the detailed guides and learn how to download YouTube videos on Mac using Safari.

You can use DistillVideo to download youtube videos for free, download from youtube without software. You can download and save video, audio/music, captions to computer, iphone, iPad or andriod device (smartphone/tablet) very easily. DistillVideo is the best youtube video downloader using url online. Supports to download youtube videos MP4, WEBM, 3GP, AVI, MP3, M4A, 8K, 6K, 4K, 2K, 1080P, 720P, 480P, 360P, 240P, 144P, etc.
In a recent allegation, YouTube, the biggest video-sharing platform, was accused of failing to follow the regulations prescribed by the act. They were found guilty and were forced to pay a settlement of 170 million dollars to the New York Attorney General and FTC for the violations. They were also asked to take measures in order to prevent further violations of the act. Thus, YouTube has asked for a revamping of its guidelines, demanding the YouTubers to tag their creations according to their targeted audience, which should later be approved.
However, even free, you can grab 4K video from YouTube with no problem. A 575.4MB file took over 10.5 minutes—no surprise with the speed restriction, but still agonizingly painful. There's an option to convert the file to MKV, AVI, or WMV as you download it. If you want a playlist, you can do them in a batch, but in my test TubeGet would only allow a max of 1080p HD even on the 8K video playlist.
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. 
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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