After unpacking the download, the app opens and after selecting Custom Install, the usual screen appears where it is 'Searching for drivers' or something like that. This usually takes a few seconds. With the current 19.7.1 download it hangs at this point permanently. In Task Manager the process appears to be running normally, but it never finds the driver you have just downloaded and unpacked.
I decided to roll back to the previous driver and re-downloaded it from the website. During the install process, this time it recognized that I had an option to install 19.7.1, so I selected that and the download hung at 99% and nothing further happened.
I have now gone back to 19.6.3 and am staying there until I hear online that 19.7.1 can be installed as expected.