Quicken Classic Business & Personal R65.29 - When on the Planning → Tax Center page, clicking the Show Tax Planner link causes the Quicken Installer to launch, which then fails with "Error 1706: No valid source could be found for product Quicken" because its looking for an installation CD.
This seems to be very similar to the issue:
It looks like there was a patch created for that earlier version but is not applicable to this version.