You have a few extensions installed that are replaced By Design Extender:
Pro Maps for Google
This should not be installed if you are installing design extender.
You also have Dynamic Web Charts installed, this was replaced by Dynamic flash charts. You should not be installing Dynamic Web Charts.
leaving those extensions out of the installation, for the extensions left in your list, tho only ones you need to worry about the order installed are:
Make sure those are the last ones installed in that order.
Looking at your list, you may qualify for the $149 upgrade price to Data Bridge.
Data Bridge would give you the simplest install path:
Tools For Google
PayPal eCommerce Toolkit
PayPal Payment Buttons