ICal1.5.5 won't run on MacBook?

My MacBook is 10.6.8, couple of years old.  I've long had some issues with Google, but it had gotten so bad, I trashed iCal and downloaded 1.5.5, but now am told that it cannot be loaded onto my computer.  Any ideas of what might be the problem?

Virginia,
There is no downloadable iCal for your Snow Leopard OS X system.
To reinstall iCal:
1. Insert the Snow Leopard Installation disk into the computer.
2. The disk will appear on the desktop.
3. Double click on the "Optional Installs" folder.
4. Double click on the "Optional Installs.mpkg."
5. Click on (Continue) in Introduction.
6. Click on (Continue) in Software License Agreement.
7. Click on (Agree) to agree to the terms of the software license agreement.
8. Click on the disclosure arrow ▶ next to Applications.
9. Select (✓) iCal.
10. Click (Continue).
11. After iCal has been reinstalled, download and install the Mac OS X 10.6.8 Update Combo v1.1 to bring iCal up to the most recent version.

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