When you configured IIS for 32-bit mode, did you change both the
DefaultAppPool and the Application Pool Defaults? Both need to be
changed to enable 32-bit mode, then IIS needs to be reset.

You can also see this error if you didn't properly configure IIS to
have the appropriate role services. Check what you have against the
install guide and make sure you've added everything you need to add.
Also, if possible, you should be using built-in Admin to install, to
avoid certain permission issues.

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