Photoshop CS3?

Well, I'm screwing.

Due to my mac's logic board failing and having to pay 200 for it to be fixed, they couldnt save my Adobe family or my Logic Pro.

I've lost my Logic Pro's serial key and I got Adobe (PS, DW, Ill etc.) from a friend for 100 pound.

Could anyone point me in the right direction to get Photoshop back? Also, I'm not too good with torrents and might need a guide.

Thank you if you can help! This could change my whole career!