It also disappeared for me. I had several issues and contacted customer support. They advised me to attempt to uninstall and reinstall, which I did, and it still did not work. I contacted tech support again and the gentleman suggested I attempt to uninstall and reinstall again, or try System Restore from a previous date when the downloader was still working. I humored him and tried that as well, and it did nothing to fix the issue.
Originally it had the error :error in event handler: error: attempting to use a disconnected port object, but reinstalling did nothing to fix that. Then got uncaught (in promise) typeerror failed to fetch service worker and npm install ytdl-core@latest.
Eventually the third person at customer service I spoke to advised me to clear all caches, unplug all accessories and try a fresh uninstall/reinstall. I did that, and when I reinstalled and then restarted my computer the extension was just gone from my list of browser extensions. The fourth person at customer service I spoke to advised me that it was being recalled and worked on, so it was removed for a large group of individuals. When I asked him why that would be, since I was paying for the service and not using the free version. He said it was an "across the board change that affected a large percentage of users." I asked when it would be restored and he said he had no clue.
Does anyone know if this is factual? Has anyone else gone through these hoops I did? Really frustrated here.