An install from MSI of a higher version of mongodb will remove a lower version install even if they are both installed in custom locations. See reproduction for more detail.
Also note that you cannot install via MSI a lower version than you have currently installed. This may be a separate, but somewhat related bug.
- is duplicated by
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SERVER-16614 Windows: should allow users to install 2.6 and 2.8 enterprise versions
- Closed