Hi. Have you attempted the steps here http://www.satechhelp.co.za/7948/Fix-Launcher-3-Stopped-Working-Android-Tablet ? Also, if the tablet has internet, instead of downloading the app to you SD card, you can, after access all apps, tap Play Store instead of File Manager > then search for AWD Launcher > download it and installed it. You may have to access the Apps list again, locate Laucher 3, Disable it or uninstall it.
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