Experiencing a similar issue. Video search comes back with not found, pasting a Youtube URL results in an error dialog.
 
	I unblocked all the DLLs in the directory using powershell:
 
dir -Path [directory path] -Recurse | Unblock-File
	This plugin would be a life saver for my PC game collection, up untill know I keep finding YouTube trailers and downloading them by hand every time.
 
	Hope it can be fixed. ?
 
	 
 
	In the meantime I have found a somewhat optimized workflow to get video's quickly:
 
	- Open YouTube in browser
 
	- Open 4K Video Download
 
	- Search in YouTube for <game name> gameplay
 
	- Set YouTube filter options to "Short"
 
	- Hoover over videos or open until a nice one is found
 
	- Copy URL
 
	- Switch tab to 4K Video Download, press Paste Link, select quality
 
	- Adapt/default to Launchbox videofolder of choice (will remain set for next time)
 
	- Adjust video name to match game name
 
	- Hit download
 
	- Repeat for next game
 
	Only downside in my opinion is that a lot of these videos features company intro's (Nintendo, IGN etc) and various disclaimers (age restrictions etc) that show up the first 5-15 seconds and these can't be cropped easily. Open to improvements!