ISO image

Two things
1) it sounds as though you download the combined 32 bit & 64 bit ISO
each bit version of the ISO is only a little over 3 GB

2) You could Download Virtual CD-ROM Control Panel from Official Microsoft Download Center to mount the ISO and run the upgrade directly from that.
I just came across this, so let me know how if it works out for you

3) You could download just the bit depth that matches your current install. If you are trying to change from 32-bit to 64-bit then you'll have to do a clean install afterwards. I'm fairly certain that an upgrade will NOT allow you to change the bit-depth - could be wrong on that as far as Win10 goes though. Lots of new things have been added to many processes.

See if there's anything about that here: Support - Windows 10 Help

bigsi100 said:

Hi
My apologies if this has been asked already. I've downloaded the ISO image and tried to burn it to DVD only to find that is too large 5.6 GIG and doesn't fit on a 4.7 : is there a way to get it to fit or can I extract it to desktop and run it from there?

Any assistance greatly appreciated.

Many thanks

Si

You can try Direct Zip Driver to extract it. :)

Thanks everyone for your assistance its greatly appreciated.
Kind regards
Si

The ISO for Windows 10 is only about 3 GB, so something is wrong with your file.