On YouTube : https://www.youtube.com/watch?v=RgKAFK5djSk
Go to Th-Film.com Delete https://www. and then insert Th-Film.com in the front like : Th-Film.com.com/watch?v=RgKAFK5djSk
Play the video, then Right Click Copy video URL. See screenshot below.
Go to ThaiVideo.Site. Then paste the URL and Click 'Download', like the screenshot below
Click on "the video"
Choose the link for "Download quality video that you need". Below player screen
Note 1: If the video opens up instead of downloading, then on Step 4 Right Click the link and "Save as..." to download the video.