Download YouTube HD videos free
Install free program
Download and install Freemake Video Downloader. Enable "One-click mode" and set the following parameters: "Best quality", action "Download" and choose a destination folder.
Copy YouTube video link
Go to YouTube page and copy the address of the HD video you want to download.
Download YouTube in HD
Paste URL in the program. Your video will be downloaded in HD automatically. Download more HD videos in the same way.
You can also download YouTube to AVI or MP4 with Freemake software.