How does Sage Intelligence decide which Excel to use?

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Hi everyone, 

I have two Excel versions installed on my computer (Excel 2010 and Excel 365) because I need both for work. When I only had Excel 2010, SI works fine. And then I had Excel 365 installed, SI switched to using Excel 365. This morning, SI starts to use Excel 2010 again. 

Does anyone know how to check which Excel SI is using? I want to make sure SI only uses Excel 2010. Thanks !!