Choose YouTube-video-downloader-1.1.4.safariextz, go to your downloads folder and double click the YouTube-video-downloader-1.1.4.safariextz file.
It installs for me, it shows in Extensions in Safari prefs, but I get no Download Now button, it seems to be broken. It's been over a year since he wrote the extension, must not be compatible the newest Safari.
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