You can download a 30 day demo and it is fully functional but I don't know of any free software.
The upgrade is a lot less. All you need is some old serial number that is typed in when you finally pay for it. It can be a serial number that you borrow from someone or someplace as Adobe doesn't actually check who the serial number belonged to or anything. I just did this for the new version of Photoshop and GoLive.
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