How can I re-install ical?

Hello, I have had major problems with Ical since upgrading to Yosemite with ical invitations not being accepted and having the dreaded 404 error. I mistakenly deleted some files from the library and now it will not work at all with iCloud.
How can I do a clean instal Ical of Ical? I can't find the download anywhere. Is there a better slander option that will also sync with iCloud?
Many thanks in advance.

What files did you delete?

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