Whenever I try to download an app in the Google Play Store on my Samsung Galaxy S3, it keeps saying "package file invalid" and won't let me download anything. The message also has a triangle with a ! inside it.
Try downloading via WIFI.
I had this issue recently, same phone. Tried a few times; both on PC and on the device itself each failed. I realized WiFi was off (mobile data only). I turned WiFi on and the file downloaded first go.
This worked for me.
protected by Flow Jan 7 '13 at 6:10
Thank you for your interest in this question.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site.
Would you like to answer one of these unanswered questions instead?