Ok, follow the below link to re-download all your purchased apps.
Read this:
To re-download all your apps into iTunes.
First you need to authorize your iTunes. (Store > Authorize Computer)
Next, check for available downloads (Store > Check For Available Downloads)
iTunes will then check for what you have purchased before, and give you an option to re-download your purchased apps.
To see a listing of all the apps you have purchased or downloaded, do this :
Go to Store > View My Account
Login
Click on "Purchase History"
You should now see all the apps you have downloaded before.
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