Nothing, carry on and when your ready to re start just click on it again and it will start to download
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Once the app is updating, you can only pause the update. You cannot stop the update. You will have to wait until it is finished updating to do whatever you want with that app.
There is an App Store app on the iPod Touch that is used to download apps.
If the app was free you can just down load it again from the app store If it was a paid app it should download on to your i device after syncing to your computer However if you are pc free you might not be able to download it again
Once you have downloaded an app, you can't download it again in order to have 2 copies of it on the same device. If you delete the app, you can then download it again. If it is a paid for app and you use the same iTunes account then you won't be charged again for downloading it.
A PS3 game download can be paused by clicking "Download in Background." The PS3 can also be shut off, and when it is turned back on the download will resume.