Problem with Mac App Store and previous app versions

what happens if mac app store (mas) customer purchases app compatible @ time snow leopard, example, , later somehow loses app -- but, latest version in mac app store has since been bumped require lion?

far in experience, customers left holding bag. mas apparently has no provision restoring older version of app customer purchased compatible os x version had installed @ time, , still have installed.

can't handle developer because apple prevents me distributing mas apps customers, plus have no means verify whether mas customer or not.

perhaps can clarify situation seems glaring hole in mas customer support.

 

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