How to verify Fluentd is installed on windows system or not using wix installer from other product

Hello,

I have my WiX toolset msi installer file and in that I want to check fluentd is installed on that machine or not.
I have checked after installing td-agent it makes entry inside registry under Computer\HKEY_CURRENT_USER\Software\Treasure Data, Inc but that is for current user only.

So is there anything fluentd do while its installation that I can check and make sure fluentd is installed on machine where I am running my MSI ?

Thanks in advance for any help !!

Currently, we use HKCU for manage td-agent installation.

How about using runas command to work on installed user?
see: Runas | Microsoft Docs

This can be visible on switched user via runas.