On YouTube, the high resolution of most videos is stored as VP9 or AV1 video codec. You need to choose VP9 codec if you want to download the 4K resolution.
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1. At the top left, open the Apple menu. 2. Select About This Mac. 3. In the "Overview" tab, look for "Processor" or "Chip". 4. Check if it says "Intel" or "Apple".