Adobe has been absolutely horrible with their MSI upgrade table (I haven't looked at this particular version), so I would not be surprised if there is an issue.
Have you tried manually installing this without the /qn just to confirm the same response?
If so, you might need to create a simple wrapper to remove the previous version, alternatively you can add this version as a supersedence for the previous in SCCM (assuming an SCCM deployment method is being used).
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