as others have alluded to, that icon is literally only an advert saying you can get it.
try opening a cmd prompt as administrator and typing wuauclt.exe/upgradenow
It took me 3 days to work out why my win 7 wouldn't update, turns out I had one hotfix missing.
try running this tool if the update fails
https://support.microsoft.com/en-gb/gp/windows-update-issues/en-gb
for some reason win 8.1 has to be up to date for win 10 to install
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Thanks for the advice, still not sure what to do right now and not even sure if I can be bothered to be jumping through all these hoops to get an OS I may or may not want. I happen to really like windows 7 but if the performance is much improved in 10 then I'd give it a shot.
I have tried the above fixes and a few other but still get the error code 80070005.
I have actually called microsoft support today in some call centre with an appallingly bad line but she just gave me the above methods I'd already tried.
It seems absurd that if I want to install from a bootable disk or usb (and format my drive first) I may have to download a pirated copy but if I can't get the upgrade to work then what choice do I have?
Steve