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Try uninstalling SMM2 from the Windows Settings (Add or remove programs) or Windows Control Panel.
If uninstalling SMM2 from the settings or control panel still doesn't work, install a version of SMM2 (https://github.com/satisfactorymodding/SatisfactoryModManager/releases/tag/v2.9.3) such that there is something valid to uninstall, then try installing SMM3 again
-# Responding to
smm2uninstallfailed triggered by @IronMan