You need to check out if the application is interoperable with the current OS version on your smartphone.
Go to SetUp>check out the Android version in use on the smartphone under the Phone Info. Check out the OS version supported on the Download Page for apps downloaded.
Download the version interoperable with the OS.
Some applications may not be interoperable due to resolution issues, e.g. Pad/Optimus View.
Find help information for your LG product