Step 1. Install free program
Download and install Freemake Video Downloader. Run the software.
Step 2. Copy YouTube video link
Go to YouTube video page and copy the URL of the 1080p video you want to download. Open Freemake Video Downloader & click "Paste URL". Then choose 1080p in the list of available settings.
Note! If there's no 1080p option, it means that such quality is unavailable for this video.
Step 3. Download 1080p YouTube video
Choose the action "Download" or "Convert" (and select MP4 output format or device) and wait while your video is being downloaded. You may also download YouTube in 720p and other qualities.