I ask the following not to be argumentative, but to actually understand your thinking: Why are you recommending the purchase of Windows 10 at all for this particular hardware?
It is almost certainly not certified to run Win10 by its maker [does Gateway even exist anymore? - I have a Gateway desktop running Win10 Pro 32-bit], the cost for the license is approaching $200 [for Pro, anyway, and Home is not that much cheaper], and you can purchase brand new hardware that, even at the lowest end of the desktop market (and even some of the laptop market) will blow away the existing box for approximately the same cost.
I am all for reduce, reuse, recycle when that makes sense, both financial and otherwise. But it makes neither when we're talking about a 6-8 year old machine that wasn't anywhere near to "top of the line" when new.
I can't even wrap my head around this as an experiment since the purchase of Windows 10 will be involved and be expensive. Had the machine been upgraded during the early Windows Insider era then it would be on Windows 10 already, and at no cost, but now . . .
Brian AKA Bri the Tech Guy (my website address is in my profile) Windows 10 Home, 64-bit, Version 1709, Build 16299
Here is a test to find out whether your mission in life is complete. If you’re alive, it isn’t.
~ Lauren Bacall