Originally Posted by andr0it
I have tried that already. The free application knows some how that it have been installed before. Any other solutions? Regards
Depending on the App, there may not be much you can do. For example, the app may connect to a server and the server is keeping track of which devices have loaded the app.
Also, please be aware that if you are trying to extend your "free" usage period for an app...say get whatsapp for another year for free, then you really can't ask for help doing that on xda. That would be considered a form of warez and is strictly forbidden on xda.