I have downloaded and installed Ver 1.6.17 on my Windows 10 PC. No problems so far. One of the areas I had a problem with in Ver 1.51 was the Auto Freq Calibration. In Ver 1.6, that problem has been solved. I do not need to make any adjustments and feel that I can use it as-is in Frequency Measuring Tests. (As long as my math is OK) Thanks for giving me a (NEW) radio with the upgrade. Great work by all involved.