April 5, 201511 yr Hi, I need to know the proper way to update my 737-8900 series from PMDG from Service pack 1c to the new service pack (1d). Do I uninstall the while thing or just download it again? And what is the 737 installer. This is a question EVERYONE has skipped around. Its listed in the directions on PMDG's website. And can you please make a simple explanation. (Im not that much of a computer expert)
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