.msi installer does not honour INSTALL_ROOT parameter when previous versions exist
When I installed a new version with my unattended install command:
msiexec.exe /qb /i cmake-3.11.1-win64-x64.msi INSTALL_ROOT=C:\CMAKE_3_11_1 ADD_CMAKE_TO_PATH=None
the installer ignores the INSTALL_ROOT property and installs in the location of a previous installation (C:\CMAKE_2_7_1)
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