App Store problem, needs to be reinstalled? Cant find it anywhere?

On my macbook pro. Running 10.9 have error message " there is no application set to open the URL Mac App Store:// showUpdatesPage?scan=true.
How do I reinstall the app store on my computer. I deleted it, but cannot find anywhere to reinstall it. Thanks.

Developers control which versions of their app is in the store. If a developer releases a new version and pulls the old version then it will no longer be available in the store.
If you sync the device that has the older app in ITunes on your computer and choose to transfer purchases,  you will then have your own saved copy of the app. Then, sync the other device and select to install that app from the list of locally saved purchases.

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