Is there much difference between the V5.20C01 and the V5.20BW10 that should I should change to the BW10 version instead of using the C01?
As I recall, V5.20C01 was pre-loaded on new IPEdge systems as was available on Toshiba's FYI for some time. I heard that there was an issue with that version and pulled it from their site, and then came out with the Windows 10 version V5.20BW10 .
I still have V5.20C01 running on IPEdge systems that had it pre-installed. I had some initial problems, but I was able to do an update on IE11 to get it fixed.
The one thing that I know that you will be missing, that is only in V5.20BW10, is an IPEdge only setting for voicemail, Prg 579 FB22. It is not in C01 or B26. When setting up a new CIX with IPEdge voicemail you would need to change it through phone programming.
Other then that, I think if V5.20C01 is work then you should be able to stay on this version