pec771 said:
I've done and saved an 'image' using that Macrium software (on an external hard drive) but am still wavering. I really can't afford my PC to 'break'. I've also downloaded MediaCreationTool21H2 and Windows10Upgrade9252 in readiness. What would be my EXACT next steps if I were to go ahead? Explain it to me as if I were a small child (c. Jeremy Irons).

Thanks for all advice so far.
Go to this Microsoft website:
https://www.microsoft.com/en-us/soft...load/windows10

Click on the button I highlighted that says Update Now:

Updating Windows 10 from Version 1607-capture2.jpg