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How do I restore after it was accidentally deleted?

I have complete time machine backup of system, but can't find in it.

I tried optional install from original disks, but was not recognized on there - possibly because it is out of date?

I also tried updating on top of original, but that failed with an error message something like:

"Update couldn't recognize original app."

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The only way to re-install applications that are on your computer is to use your Mac OS X Install DVD (if your computer is running Mac OS X Snow Leopard or below), or Internet Recovery (if you are using OS X Lion or Mountain Lion).

In your case, it's Mac OS X Leopard. This support webpage from Apple should do the trick.

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