Suddenly stopped working

I've been using ant Download Manager with no problems for a while, but suddenly it has stopped working. I get this message when I add a YouTube video URL:
VT:YT: base.js file not found




However, it's erratic; it sometimes works, but mostly it doesn't. If I add a playlist URL it sometimes downloads one of the videos (not the first in the list). It sometimes works and sometimes doesn't, even if I use the same URL again and again or any other URL.

I've reset the settings to default, and checked my firewall is letting it through.
This occurs with or without browser integration.

Ant version 1.19.3
Chrome browser, Version 86.0.4240.183
Windows 10 Home, 64-bit, version 2004, OS build 19041.572
Intel Core i5 650 3.2GHz, 10Gb RAM

Please install the latest 2.0.0 or 2.0.1.beta

OK, thanks. Well, that removed my GAOTD license, but it works now.

Sites, video services, video protocols, browser versions change frequently, and we follow them.
Please use a latest version our software.
Giveaway builds are exeption for this advice.