Hi, you need to install GO Launcher free from the market first. 1.To Apply the Theme: After it's installed, Back to GO Launcher EX: MENU > theme preferences. 2.To Change icons: Some devices may not change the icons...
Check that you have enabled Settings -> Security -> Unknown Sources in Android 4.x or Settings -> Applications -> Unknown Sources in Android lower than 4.x
Download APK file to SD card and run in your mobile browser "content://com.android.htmlfileprovider/sdcard/filename.apk" or "file:///sdcard/filename.apk"