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How to Fix Android App Not Installed Error

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To solve this problem you just need to do 2 things. first allow unknown sources and second disable google play protection.
    Allow Unknown Sources:
  1. First open Android Settings
  2. Then go to Security option
  3. Scroll Down and turn on Unknown Sources

app not installed

    Disable Play Protect:
  1. Open Play Store
  2. Open left panel (three lines on upper left corner or swipe right)
  3. Choose Play protection
  4. Turn off Scan device for security threats if not found then touch on upper right corner and then Turn it off
app not installed

Now try to install App again

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