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.
Third-party software is where you will get the best control over downloading online videos. Typically, you paste the URL for the YouTube video you want into the program, and it downloads the highest quality version it can find. For videos in 1080p High Definition (HD) format, that's usually an MP4 file. For anything higher in quality—4K and even 8K videos—the file format is typically MKV.
Step 1. Click the button below to download the YouTube Channel Downloader and follow the on-screen prompts to install it on your computer. After the installation process, run the program. This will be followed by a pop-up window that asks you to enter the registration code. If you have one, click on the “Register” option and enter your code along with your email. If you don’t have a code, you can either click on “Buy Now” to get a 20-digit registration code or close this window to choose the free trial option automatically.
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.)
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.
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.