Hello Diane,
As a convenience for most of our users who do install the Design and Workflow tools we have this "prerequisite" system that enables you to easily install all the Windows components necessary for our product to work. Sadly this system (from InstallShield) is not very flexible and needs to be done before the actual Setup of our product take place. This means we cannot propose less items if the user will only want to install PP Search (which requires none of these).
What you can do to work around this system would be to unplug your computer from the network, start the installer, it will not be able to find the prerequisites on the Internet and thus will propose you to continue even though it didn't find them. Simply select to continue, make sure you only select PP Search and complete the installation.
Also make sure Acrobat Reader or the Acrobat software is installed before you install PP Search.
Let us know how it goes.
Best regards,