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The problem occurs, as suggested by the answer by @ChuckC because the uninstaller does not request privilege escalation so if it's run unelevated, e.g. by double clicking uninstall.exe, it's unable to delete files in protected directories such as "C:\Program Files\Wireshark".

Change 37955 and the related ones for other versions (3.2, 3.0 and 2.6) modifies the uninstaller to always request elevated privileges and is available now for automated builds and will be in the next releases when they are made.

Note that the uninstaller won't delete files that it doesn't know about, so if other files are in the install directory, e.g. a capture made with elevated privileges, the installer will note it was unable to delete the application directory.

The problem occurs, as suggested by the answer by @ChuckC @ChuckC, because the uninstaller does not request privilege escalation so if it's run unelevated, e.g. by double clicking uninstall.exe, it's unable to delete files in protected directories such as "C:\Program Files\Wireshark".

Change 37955 and the related ones for other versions (3.2, 3.0 and 2.6) modifies the uninstaller to always request elevated privileges and is available now for automated builds and will be in the next releases when they are made.

Note that the uninstaller won't delete files that it doesn't know about, so if other files are in the install directory, e.g. a capture made with elevated privileges, the installer will note it was unable to delete the application directory.