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Remove any installed liveries for the 737 from the Operations Center
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Uninstall the 737 from add/remove programs.
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Go too {SIM}\Community and make sure there is no pmdg-aircraft-737 folder. If there is delete it. Basically:
3.a. Go to C:\Users{username}\AppData\Local\Packages\Microso ft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packag es\Community\ and make sure there is no pmdg-aircraft-737 folder if there is delete it
3.b. Go to C:\Users{username}\AppData\Local\Packages\Microso ft.FlightSimulator_8wekyb3d8bbwe\LocalCache\SimObj ects\Airplanes and delete any PMDG 737-XXXXX folders if they exist
3.c. Go to C:\Users{username}\AppData\Local\Packages\Microso ft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packag es\ and make sure there is no pmdg-aircraft-737 folder if there is delete it.
3.d. Go to C:\Users{username}\AppData\Local\Packages\Microso ft.FlightSimulator_8wekyb3d8bbwe\LocalState\packag es and delete the PMDG-aircraft-737 directory
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Install again making sure you run the installer as administrator. Right click and select run as administrator.
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Rebbot the PC after the installation.