Sage 300 Intelligence Reporting Excel.Interop error

I have two clients that were running SI fine and now both of them cannot save or distribute reports. When they go to do so they get an error stating that Micrsoft.Office.Excel.Interop v12.00 cannot be located. 

Looking in the registry it appears that version 15.00 is registered but I have other clients running this way that are not having the issue. 

I have tried reinstalling / repairing both Office and SI with no change. 

Has anyone else seen this issue? One client is 300 2017 the other is 2018