Hey, Vyandor, did you ever get a response from support on this? I'm now in the same position. Edit: Resolved. While there's no option on the steam store itself, the Stardock Sins of a Solar Empire II website does have the option to purchase the upgrade and will provide you with a steam key for that upgrade. I'll post the relevant link for anyone else looking for this. https://www.sinsofasolarempire2.co
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