Please answer my questions in my previous post.
Is the computer that you want to install Windows 10 the old one?
Did this computer have Windows 10 installed on it at any time?
What operating system do you have installed on this computer currently?
If you had Windows 10 installed on that computer you can use the instructions in my previous post.
If you did not have Windows 10 installed on this computer but had Windows 7 or Windows 8.1 you can upgrade to Windows 10 by using the Assistive Technologies option. Microsoft doesn't check to see if you are using Assistive Technologies or not so you will have no problem doing this upgrade. This option will cease to be available by December 31st of this year.