I downloaded free version first at all. Then I purchased pro version in app and after it all was good, but I needed uninstall it and reinstall. The problem now is that I can’t acces to pro version anyway, either in playstore or in-app, but I have in my account a receipt that say:
You’ve made a purchase from Smartlab on Google Play.
Order number: GPA.1315-8267-3006-08793
Order date: Aug 27, 2016 2:55:18 PM CST
Upgrade to PRO (TabShop – Point of Sale POS)
Questions? Contact Smartlab.
P.D.: I’ve used the same device ever.