I recently purchased the express version through Steam...will I still have the option to upgrade my product as I would if I bought it through this website without buying a separate license?

Yes, we plan to add upgrades to Steam by the end of May. If you need the license urgently, we can give you discount coupon code to order through our website. But this license will not be associated with your Steam account, and it will be locked to 1 computer. Your Steam license will remain operational in this case.

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iPi Soft