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“Failed applying patch change” error

The error message reading “Failed applying patch change to “C:\program files (86)\the witcher 2\launcher.exe”” appears if the game launcher is on during the patch installation. The launcher should be closed during patching.

If an error occurs despite closing the launcher, kill launcher.exe process in Windows Task Manager (you can use ctrl+alt+esc to open it) and re-apply the patch.