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available on Google Play

Install/Update latest Öffi from Google Play

Download/Install Öffi 7.0 from here, only in case Google Play does not work for you

Download/Install Öffi 6.88 from here, only in case you own an Android 1.6 device

Download/Install Öffi 5.24 from here, only in case you own an Android 1.5 device