If I remember correctly, didn't Samsung users have to go through their app store to get an update (if one was available)?
Not for the galaxy note 10.1, yes on my galaxy s3. But, its the same as google play. Sometimes its there we can find apps for samsung only but ps touch isn't only for galaxy note, in fact ps touch doesn't have an option to use only the pen and deactivate action out of the pen like sketch pro does
Envoyé depuis un mobile
If you ...
then the link to the latest free update should be brought up (see attached screenshot). This will take you to version 1.5.1.