Instead of downloading anything from a popup, follow simple steps to check whether you really need to update  Flash on android.
 
Go to the android menu and click System Preferences.
 
In the bottom left corner, choose Flash Player.
 
Choose the Updates tab.
 
Click the Check Now button.
 
If an update is available, click Yes to update. If no updates are available, you have the latest version of Flash Player for android installed.Easy enough, right? Make sure to invest some time and check if you need to update Flash. Otherwise, downloading a false software package may harm your computer.