How to install APK from PC?

adb install <path_to_apk>

http://developer.android.com/guide/developing/tools/adb.html#move

Connect Android device to PC via USB cable and turn on USB storage.
Copy .apk file to attached device's storage.
Turn off USB storage and disconnect it from PC.
Check the option Settings → Applications → Unknown sources OR Settings > Security > Unknown Sources.
Open FileManager app and click on the copied .apk file. If you can't fine the apk file try searching or allowing hidden files. It will ask you whether to install this app or not. Click Yes or OK.

This procedure works even if ADB is not available.

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