Was it bought on iTunes or Google Play?
If the latter, go into the Play Store app, tap the icon in the upper left (or swipe from the left edge) > My apps. Tap "All" in the upper left and find PS Touch in the list.
This all assumes you're signed into the same Google account you bought PS Touch on.
Thank you I did try that and I'm not sure why but it works in the samsung
galaxy s3 but not compatible with the samsung galaxy tab 3 lol go figure.