Silent Installation:
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npp.7.x.x.Installer.x64.exe /S
Note: this is case sensitive - be sure to use capital "S"!
Silent Uninstall:
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"%ProgramFiles%\Notepad++\Uninstall.exe" /S
Note: capital "S" again
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Copied from V. 5.x. Credits and thanks to user freeality for the important hint with the capital "S".
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