• Version: 19.54.0

• Target: Windows x64

NSIS uninstaller checks the app is still running and kills it by nsProcess::KillProcess before deleting the installed files. However, nsProcess::KillProcess seems neither emitting any window-alll-closed and quit events, nor kills child (and grand child) processes. Hence, child processes spawned by the app keep running and block files are deleted.

Using taskkill instead of nsProcess::KillProcess might solve this problem.

I found some related discussions:

• Kill a spawned process, on windows
• before-quit, will-quit and quit not triggered on windows 10
• Quit gracefully when Ctrl-C is pressed in console