You can use this purchase method for the Windows or Mac version
How to buy SMS Export from the iPhone AppStore:
1) Download the trial version for your PC or Mac from the download page
2) Open iTunes and buy SMS Export for iPhone (click here)
3) Wait the download of the application from the App Store (you should have SMS Export in the list of your Apps in iTunes.
4) Run SMS Export for your PC or Mac. The Export button will be enabled after you click "Import SMS from iTunes"
Rated SMS Export
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