How to exclude iPad1 from downloading my app ?

You can either exclude all iPads, by using:

<key>UIDeviceFamily</key>

<array>

     <string>1</string>

<array>

inside InfoAdditions tag in your application.xml,

or

you can include all iPads by including 

<string>2</string>

Currently, there is no way to include/exclude a particular version of iPad/iPhone.

You may log a feature request for the same at wishforms

You can exculde devices based on os version at least by using minimumosversion key in the entitlements.