I downloaded the trial on steam. It says that all i need to do is go online and upgrade your account, but if i do that do i have to re-download it to pay for the main game and not the description?
If you play the trial and decide you'd like to give the game a shot, you will have to purchase a copy of STO, in addition to setting up a payment method for subscription fees. You can't just use the trial client and sign up for a subscription. I don't think you would have to download an entirely different client though. All you should really need is the game key to apply to your Cryptic account.
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Hope this answers your question.