AppleScript file to download youtube videos

youtubedownloader.scpt

	(*
		script to download videos from youtube using the youtube-dl program
		you can paste this code in a ScriptEditor file or use it inside a
		'Run AppleScript' block in an Automator Application
	*)
  
  set question to display dialog "Youtube URL to fetch?" default answer "" buttons {"Cancel", "Open in Browser", "Download"} default button 3
	set pageURL to (text returned of result)
	if pageURL is "" then return "No URL"
	set choice to (button returned of question)
	
	set progress total steps to 1
	set progress completed steps to 0
	set progress description to "Downloading video..."
	
	if choice is "Download" then
		try
			set pid to do shell script "cd ~/Downloads/youtube/; /usr/local/bin/youtube-dl --newline " & pageURL & " > /tmp/vidstatus 2>&1 & echo $!"
			delay 1
			repeat while ((do shell script "kill -0 " & pid) is "") -- check if pid is still responding
				-- display dialog "Status: " & (do shell script "tail -n1 /tmp/vidstatus") -- display last line of output
				set progress completed steps to 0
			end repeat
		on error
			set progress completed steps to 1
			display dialog "Download complete!" -- eh, success, hopefully :) 
			set progress total steps to 0
			set progress completed steps to 0
			set progress description to "Done!"
		end try
		
	else if choice is "Open in Browser" then
		try
			open location pageURL
		on error
			display dialog "Cannot open " + pageURL + " !"
		end try
	end if
	
	return input

Hi, this script isn't working in Catalina 10.15.7, I get the "return input" undefined and also no video is downloaded at all. I tried your revision too but encountered the same problem...