MW2 Map Packs for free?

Hey guys,
I used an unlocker recently (to unlock titles, emblems, attachments, camos, ...) and it unlocked the maps under Bonus Maps (the ones you have to buy from steam).
(I havent buyied anything from steam)

So now, when I click on a map I can set it but when I click start the application crashes.

Is there any way I can get the Bonus Maps for free?

(BONUS MAPS= Stimulus & Resurgence map packs)

Thanks

i think alteriw allows the map packs to be dl'ed and isntalled i dunno, someone back me up on this (YAY FIRST REAL POST iv ever made WOOT)

i have no clue u could ask a mod or someone? google? haha