And another update. Well I got it working in that the card is now detected and Audacity will record but the only way I could do this was by installing an OLDER version of Raspian Buster. I had to install Raspian 2019-07-12, anything later than that and I found it produced Kernal errors when installing the driver. It’s also not possible to update Raspian once installed as then the card stops working again.
From what I can work out, and as a newbie, your driver does not support kernals 4.19.75 and higher.
Will there be a new driver any time soon so that we can use the latest versions of Raspian Buster?