Correct. As far as the download itself.
Edit: Clarifying what I mean, there's no separate download/server/etc for trial vs full, your account status is what determines what you have access to. You'd still end up (I believe) buying a version of the game, or getting a game time card, and adding that to the account, as I recall.
so to be completely sure i dont ahve to buy the game just pay for the account itself?
And that's why I clarified 
for whatever reason I was reading it as the software. (I'm not completely awake right now.)
If you go into account management, it's going to ask you for a serial code to upgrade from a trial to full.
(That said, you're not paying that much *more* for the game - most editions are $19.99 and come with that first month free, and I've seen versions in best buy and such for $10. You'll have to apply a code from one of them, so yeah, you'd be buying the game.)
So:
- Play trial
- Pick up full version, or game card.
- Apply code, it updates your account.
- No other software download needed, the account itself will upgrade to full.
lol ok thanks =)
i just dont want to download it all over again =/
The program software files on your hard drive which you are using to play the trial version are exactly the same as the unrestricted version.
When you log into the game, the account server knows that you're a trial account and it limits access on the server side, not by the software on your computer. And so, when you upgrade to a full account, the server will then flag you to full access to the game and nothing will change on your computer or with your software.
And just FYI: You can install or download that same software to any computer without any further charges (and there's a MAC client, too, for MAC computers). So, you can have a copy of the game on your main computer, the family computer, your lap top, a copy on grandma's computer when you visit, etc... Consider the client software to be freeware; what you pay for is access to logging into the server.
Trial accounts are temporary and free limited access.
Game accounts are a one-time fee for getting unlimited access and come with one month usage free.
Monthly fees are for continued full access.
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You need to download the entire game to play it in any capacity, even on a trial account.
Having the disc really helps when you want to reinstall though.
i was wondering this is kinda stupid but if you upgrade your account straight off the trial can keep the download and not have to buy the game?