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1. Download your application with itunes (try a freeone first )
2. Find the IPA file that was downloaded by itunes (should be in your itunes folder, "Mobile Applications")
3. rename the app (example) from GPSapp.ipa to GPAapp.zip
4. open the zip file and edit the iTunesMetadata.plist
5. Search in the file for "<key>softwareSupportedDeviceIds</key>"
right under it there is <array> and then <integer>4</integer> or something like that. (there can be more than one integer string).
now edit the file to something like this:
<key>softwareSupportedDeviceIds</key>
<array>
<integer>1</integer>
</array>
(now itunes thinks this programm is compatible with every ipod/iphone)
5. Save the plist file, maybe if you extracted the whole archive create a new one.
6. Rename GPSapp.zip back to GPSapp.ipa
7. DISCONNECT YOUR IPOD AND RESTART ITUNES!!!
8. now it should work to copy over that program.
PS: remeber, you cant update the app on the touch directly, it wont find any updates. When you update the app through itunes you have to do all the steps again!