I have a 2008 Mac Pro running El Capitan with a separate hard drive running Windows 7 through Bootcamp and it all runs well. I got an upgrade offer when I last logged on to Windows saying that I could upgrade to Windows 10 and asked whether to do so. The system report said that the PC is suitable for upgrade. Is it ok to just let it upgrade Windows or will that create problems because it's really a Bootcamp installation? Thanks for any advice.