Do some googling and you will find the free upgrade stills works as of a couple of months ago. I did an upgrade to one of my rescue machines.
In the beginning I also had issues with Windows 10 but for the last couple of years it has worked fine for me. I do not allow automatic updates but have authorized all updates when I would not interrupt my use of the computer.
I have for many years used Ubuntu for most all my computer OS needs not requiring Windows. 73, Mike