I was installing an app to the zaaptv (hd509n), and when i click on it it says "PROBLEM IN PARSING THE PACKAGE", and i searched the web where it says that you should go to settings and click the "UNKNOWN SOURCES" menu and it will then work.
my probelm is that i cant find the "UNKNOWN SOURCES" menu and I called zaap company but they told me that they cant help in that hopefully somebody can help me please!!