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@sepideh If Google Play Store says that the app is not compatible for your device, it means that the app is not compatible with the version of android you're using, i.e. KitKat 4.4 & it has nothing to do with the pricing of the app.
Parallel Space is not a completely paid app, it offers in-app purchases. Do you really have to purchase this app for installing it in Iran? Because for me, it's not so. I can download it without purchasing.