Deleted ical.app from my Mac. Can it be restored?

I thought I was cleaning out space from my hard drive and have deleted several items from my library, including the calendar app. I keep getting this error message (user/ is not a location that supports this request), which lead me to discover that the calendar is completely gone. When I search for it, it looks like this
I tried to use my OS disk to learn how to re-install it, but when the disk loads, I get the white circle with the slash through the Install Mac OSX icon.
I haven't backed it up, I haven't got Time Machine either (I'm batting a thousand here, I know). I've read that I can have another Mac user email me these packages and I can re-install them. Can anyone expand on that for me?
Thanks!

hdixon78,
In order to reinstall Calendar you will have to follow the instructions listed in OS X Mountain Lion: Reinstall OS X.

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Please answer.

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As per email.
Hi,
In the Finder (have any window open), Use the Go Menu whilst holding down the ALT key.
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Navigate to the Preferences folder.
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I am here 3 hours every evening.
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Posting here at 2.41PM (according to the Time view I have) and then emailing me 11 minutes later seems like you are giving me the hurry up.
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How to delete content you've downloaded from the iTunes Store, App Store, iBooks Store, or Mac App Store - Apple Support
http://support.apple.com/en-us/HT5772
You can delete items that you bought from the iTunes Store, App Store, iBooks Store, or Mac App Store from your iOS device, Mac, or PC. Because Apple TV (2nd and 3rd generation) plays content from the cloud, you don't need to delete items from your Apple TV.
Before you delete an item, make sure you can download it again. If you can't or need to pay to download it again, back up the item before you delete it.
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Apps
Open the section below for the device you're using.
iPhone, iPad, or iPod touch
Tap and hold the app you want to delete.
The apps will begin to jiggle.
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Mac or PC
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Click the app you want to delete.
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Hide and unhide purchases in the Mac App Store - Apple Support
http://support.apple.com/en-us/HT4928
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Open the Mac App Store.
Choose Store > Sign In, then enter your Apple ID and password.
Click Purchases.
Locate the item that you want to hide.
Click the X to the right of that item. The item will fade. The item below it, if there is one, will replace it in the list.
I hope this information helps ....
- Judy

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Deleted ical.app from my Mac. Can it be restored?

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