A registry key is left that causes the new Application Metering Plug-in installer to attempt removing the previous version.
Use the following process to find and eliminate the registry key (the deletion of the registry key can be scripted once the path is known):
reg query HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products\A64BFC04031DE2347BD701E036C9AB20
if %errorlevel% EQU 0 (
reg delete HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products\A64BFC04031DE2347BD701E036C9AB20 /f