Excel Master and Office 365
The Excel Master course is aimed at the desktop versions of excel, so if your Office 365 version, gives you access excel 2016 on your PC, then you can do the Master course.
The web versions of excel lack some of the advanced functionality that you get in the desktop versions.
The web version is not suitable for Macros, VBA, Pivots and some advanced filtering, all which you would need for the Excel Master