DNG converter 13.0 downloads to my windows 10, version 20H2 PC but won't open or run

I have run DNG converter 9.7.0.668 on my windows 10 PC for months with no problems but my download of DNG converter 13.0, downloaded yesterday won't open and run.  The 474MB exe file is resident in my download file but attempting to open it and run it gets me only a blank white square with a circle of marching dots.  Any suggestions?