Settings > Security > Scroll & check “Unknown Sources.” Upon downloading the Tubemate APK file, you have to enable the unknown sources to valid the installation. Better, you get it through the official website only, most of the other places includes the infected APKs, which might be dangerous. To get this fantastic app, go to TubeMate official website, download the latest version for your android smartphone. Select your desired video format before download.Create your custom playlist along with your account.You can easily convert your desired video to MP3.Resume and multiple downloads supported.