I installed Windows 10 in a VM on my Mac in order to find out whether the software I need to use will work correctly. Since it is older software, it does not need any network connection of any kind except to activate it. It works just fine so far. I see no advantage of Windows 10 over my day to day use of Windows 7, also on a VM. Other than the original installation, I can and do unplug both versions of Windows from the Internet. It may be that five years or less, it will be impossible to buy any software that will work independently, without an Internet connection.