CorelDRAW X8 will run in earlier versions of Windows. I'm currently running the trial version in Win 7 Ultimate 64-bit edition. I'm trying to make up my mind on whether to just buy the download version or wait to get a physical disc version of it (which I prefer).
Anyone currently using a version old as X3 will benefit from upgrading to X8. CorelDRAW didn't add proper OpenType support until version X6. Version X7 added a few more features, such as transparency stops on fountain fills, better but still not perfect AI & PDF import/export and incorporating features that were "premium" items in X6, such as the QR Code creator. Version X8 adds a new font management app and lets you use fonts that aren't even installed in the operating system. It has a scalable user interface, good for use with high res monitors. The best thing is some new graphics tablet oriented features. I've been playing around with them using a Wacom Intuos Pro tablet and they work pretty well.