to get the activation code, if i'm not misstate:
1st - open "keygen.exe" thn click Generate serial key
2nd - after u get the serial key thn copy the key in to the ps cs2
3rd - after copy it , im think the installation of PS CS2 will give u the activation number from it
4th - afetr get the activation number , copy it to the "keygen.exe" n click n click genarte auth code
5th - lastly the authorization code will display on it n thn u copy the code past it to the code require window of photoshop cs 2.
6th - thn u can use it for free ^^