Had to do a full OS install and new Avast Secure browser and now the Video Downloader is not available and the extension is missing. Any help much appreciated.
I tried the link you provided but don’t see any recommendation to fix the issue
It basically means, best you post/ask in the dedicated forum section. 
Working without any issue here?
https://d1ka0itfguscri.cloudfront.net/Lh/2022/01/27/15/48/c3VtoJVDbov/preview.jpg