New computer upgrade from Corel 4 to 7

I just purchased a new computer and it came with Windows 10 on it. I am currently using Corel draw 4 but it won't install on Windows 10. I am wanting to upgrade to Corel 7 but don't I need to install Corel draw 4 first to be able to upgrade? It's cheaper to upgrade than to buy the whole thing new. I just need to know how I need to be able to install Corel draw on my Windows 10 computer without having to pay full price since I only need the upgrade. Thanks!