WARNING!!!
I downloaded and installed the 1 March 'fixed' installer.
Don't know what was fixed, but Lounge Lizard is BROKEN!
It comes up with a weird audio setup screen when you start it up, and immediately crashes when you select ASIO. I recovered the installer for the previous release of v4.20 (which I had no trouble with) for the Recycle Bin, uninstalled the latest v4.20 and reinstalled the 31 January v4.20.
Back up and running.