how can i replace my lost registration number to sims 3 seasons [ Edited ]

[suesue]

i lost my registration number to my sim3 seasons is there a way to get a new number or do i have to buy another dvd?
my games not on the orgin website, just sims 4
which they stopped working

[Edit: Caps Lock removed]

[roberta591]

@suesue  For Seasons download gamekeyrevealer (google it) - run it on the computer that has Season - the Seasons should be displayed.