Hi my name is ***** ***** to Just Answer. I am reviewing your question and will reply ASAP.
You should be able to find it on the App store, under Purchases. If it is listed against the same Apple ID then you can download it again. See here for how to access your Purchases:
Otherwise you can try downloading the iWork'09 trial, and then run software update to get the latest version.
Click here to download the trial iWork'09 Trial
Let me know if you have any questions.