Welcome to AndroidForums! Try doing a factory data reset(delete all user data) but we have people who use your phone that might be able to help at: T-Mobile G1 - Android Forums Hope you enjoy you time at AF!
Welcome aboard. If you're able to access the Google Play store, but cannot install the app in question, then you might need to clear data from the play store app. You can find this inside applications.
Also, here is a link to that app. Try this: remove and reinsert the battery - then try to install this.
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