If you are downloading Android app or games from a third party site other than Google play store, then you may find that the application is not installing on your device. And your smartphone is throwing an error viz; 'X Application not installed'.
Sometimes, the problem can be easily solved by enabling the 'Unknown Source' from the settings menu. But the solution may not be work all the time or on all the devices.
The reason behind this problem may be the following:
1. Apk signed certificate clash
2. Unacceptable Apk name
There is only a minor difference in both the version of the application. The signed app contains an extra folder i.e. 'META-INF' which also contains the following,
What is the difference between signed and unsigned apk?
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