Corel Draw 7 OLD version

Hi. I have an old version of Draw7 which I have been using for years. At some stage you could get service packs for Corel, which I downloaded and installed as they were available. I recently had to re-install my software but no longer had the service pack files and they are no longer available from Corel. My existing saved files won't open as they say they were created from a newer version, presumably because of these service packs. Is it possible to get a copy of these service packs?