Sims 3 Pets - corrupt disk image

I downloaded The Sims 3 Pets expansion pack on pirate bay today. It is my first time downloading an expansion pack and for some reason I cannot get the game to mount. Everytime I select the file (its an iso) it comes up with a screen saying "The disk image file is corrupt".  I've updated by base game and downloaded the fix AND replaced the crack into the Sims 3 game/bin but it hasn't changed anything! Ive been trying for hours to fix this so please help!

thankyou!

Jaemie

some files are probably missing from the downloaded pack. not completely sure, though. try re-downloading the pack from g4tw's

I downloaded g4tw's download from pirate bay, don't really want to download it again for it to not work again :/ thanks anyway. please let me know if you have any other ideas

I cant even open the file. the file is 'flt-ts3p' it wont extract using WinRAR either.

I cant even open the file. the file is 'flt-ts3p' it wont extract using WinRAR either.