Ini ane cobanya di mozilla, untuk browser chrome dll silahkan menyesuaikan..
1. Install adds-on mozilla : Flash Video Downloader – Youtube HD Download [4K]
2. buka tutorial link:
Using VLC Player 1 Use this method if you have VLC Player installed on your computer. VLC Player is a popular media player, and there's a good chance that you already have it installed. You can use VLC Player to access the actual video file on YouTube's servers, allowing you to download it directly to your computer. You can install VLC Player for free from videolan.org. The program is open-source and free, and no one profits from you installing it. This method is recommended if you don't want to have to deal with ads, extensions, or the command line. The video will also download in the highest possible quality. 2 Copy the URL of the video you want to download. Go to the YouTube website and copy the address of the video you want to download. Make sure to copy the entire URL. 3 Open VLC Player. Once you have the URL copied, launch VLC Player. 4 Click the "Media" menu and select "Open Network Stream." This will open a new window. 5 Paste the YouTube video's URL into the field. Make sure the entire URL got copied. 6 Click "Play" to start streaming the video. The video will begin playing in VLC. 7 Click "Tools" and select "Codec Information." You can also press Ctrl/⌘ Command+J. 8 Right-click the text in the "Location" field at the bottom and click "Select All." This will select everything in the field. 9 Copy the selected text. Either right-click the selection and choose "Copy," or press Ctrl/⌘ Command+C. 10 Open a new browser tab and paste the copied text. This will load the video directly in your browser. 11 Right-click the video in your browser and select "Save video as." This will open the Save As window. 12 Give the video a name and select a location. By default, video will be named "videoplayback." You can change this to whatever you'd like and select where you want to save it. 13 Save the video. The video will be downloaded to your computer at the highest quality and saved to the location you specified.