I could not find your question from a few days ago.
Nonetheless, your board and processor are simply not supported. All good things must come to an end of support.
Look under "discontinued" here: Supported Operating Systems for Intel® Desktop Boards
And look here for your processor: Intel® Processor Support for Microsoft Windows® 10
It is not to "ditch" your old PC. Technologies change. Tell me that you can watch a nice, new 4K video on your old Motorola TV. The requirements of W10 drive this as much as anything. And, no one is stopping you from using W7 or XP on the DG31PR (or watching a video on your Motorola, or xga monitor).
You board is already 9 years old: Intel® Desktop Board DG31PR Specifications
Question: How many times have you updated to a newer phone in the past 9 years? The old 2g phones worked fine. Hard to find a carrier that supports 2g today.
Your board and cpu are simply no longer supported. Time to upgrade.
My 2 cents worth: It costs a ruddy fortune to support products. The more products you support - and the more O/Ss you support it for - the higher the costs go. That's why they (have to) draw the line where they do. Think about it this way: are you willing to pay more when purchasing a new product so that someone else's ancient product stays supported? I think not...