How to upgrade from version 4 to 5 after upgrading on iPad without paying again?

I just upgraded to Version 5 (with the full Version 4 bundle, which I purchased earlier) on my iPad and purchased the Handwriting Tool (which does not work, see my other post). It is noted, that users of Version 5 on iPad get the app on iPhone for free. So I tried to upgrade my iPhone Version 4 but I do not get it for free. Appstore asks me to agree to purchase it for €16.99. So how can I upgrade my iphone Version 4 to Version 5 without having to pay once more?
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