After I factory reset my s4 some apps was reinstalled easily, while others didn't work as it used and some can't be found in play store(youtube downloader). All music downloader won't work. I had simple mp3 downloader before now it doesn't work. I need your help 😭😭😭
TubeMate (and all similar YouTube video downloaders) were removed from the Play Store for violating Google's Terms and Conditions. Simple MP3 Downloader was also removed for this reason. You probably downloaded the apps before they were removed from the Play Store, so that is why you had them before.