I was suggesting that you might want to have a copy of the Sage download file burnt to a DVD and you asked 'Where do I find the file?', hence my response and directions to the site where you can download it from if you have not already got it somewhere else.
Having downloaded the file to your desktop, for example, open Windows Explorer, locate the file and highlight it. Then select 'burn' and follow the instructions. Et Voila! you have a DVD containing the software for Sage Instant Accounts safe for reinstall in the event you have to reformat your computer.