New
#250
Hello Charlie, and welcome to Ten Forums. :)
That's correct. The ISO will need to be the same as what you currently have installed.
Are you able to update Windows 10 instead to see if that may help. If not, then at least you will have the current build installed to be able to get an ISO for.
https://www.tenforums.com/tutorials/4...dows-10-a.html