Search notes:

Registry: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun

See also

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun\REGISTRY
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\_version_\Common\InstallRoot\Virtual
Office Click-to-Run
%CommonProgramFiles%\microsoft shared\ClickToRun

Index