I've installed Messaging + on my Windows 10 PC. I can get it going to the point of getting the code. I input the code and it tells me I have to turn off a device. Is there a device limit? Where do I find my list of devices? My Windows 10 PC was an upgrade to Windows 7 which had Messaging which worked flawlessly. I'd just like to get it going on the upgraded PC. Any help is greatly appreciated.