have you tried getting the keygen for the photoshop? once you have it, it will be like you have the real thing. you can try to google it.
here's a link for adobe photoshop cs4 & cs3 keygens:
http://www.dailytipz...tor-100-working (you will need to have winrar to open the file). For the cs4, you should open Info.txt first to know how to do it.
If that still doesn't help you, you can youtube a video for it. there are tons of videos on how to do this
I hope this helps, if not, please tell me and I will try help you ^^