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I'm pretty sure that the extended download is only valid for a year. There's actually no reason to ever even pay that at all; all you need to do is to save the installer in your downloads folder or move it to another location for safekeeping so you'll always have access to it.
After downloading I did save all the files which I think were .exe files but cannot now find them on my desktop, latop, NAS or any USB stick. Might have to trawl through many burned DVDs. I live and learn!