The problem with this suggestion is that it won't last a switched SD card, 
factory reset or new device. I don't think that there's is a real good 
solution to this problem other than maintaining the paid app. You could 
transform the paid app into an "unlock key" and require your users to 
install the free version. After a grace period you can unpublish the unlock 
key app. I believe that your customers who purchased the paid version will 
still be able to download the unpublished app.


On Monday, December 3, 2012 7:57:59 PM UTC-6, niko20 wrote:
>
> Maybe try and use something that would be on their device that you created 
> ( a folder, etc) as an indicator they are a previous customer.
>
>
>
> On Monday, December 3, 2012 2:37:34 PM UTC-6, Brill Pappin wrote:
>>
>> FYI - What I'm doing is switching from a free/paid version free with ads, 
>> to a single version that will have ads until an in-app purchase is made.
>> Obviously I don't want to screw the legacy customers with ads they have 
>> to then pay to get rid of.
>>
>

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