I'd confirm my issue was the Cm15 prior to getting any new hardware.
Test with a PC running a 32bit version of Windows.
If the only issue is downloading to the Cm15 and it works fine otherwise. There are lots of options.
I am running 32 bit Windows. The only issue I have is trying to dnload macros or update the hardware interface.
I changed all my macros and timers to run from the PC. They all work just fine. So it looks like the problem could be related to a MSoft update.
You might reach out to Sammie at Smartenit and ask about replacement availability or including a spare for an additional $20 and see what she says.
I'll reach out to Sammie later today about replacement availability.
Since the CM15A still works from the PC, I am looking at the following options.
Do nothing.
Look into the Smartenit hub
Look at other software that can use the CM15A or equivalent.
Right now, I only have X10 around my house but will probably have other non-X10 hardware.
The AHP software has served me well over the years but it takes some trial and error to get thing working correctly. An example is when I just switched to having the macros run from the PC. When they were running from the interface, I had to put delays within them for them to work. Running from the PC, the macros work without the delays. (go figure)
With that in mind, I have been looking at HomeSeer since it works with the CM15A and other hardware to run X10 (ACT TI103 X-10 Computer Interface or others). Homeseer works with a lot of hardware and has a large community base of users.
So....it looks like my analysis will continue for a little while since this is what I do.
Thanks