So I got this 2.3 gb Pro plus C2R Img file from microsoft website. What is C2R version's main purpose? I see its easy to install by just clicking. I was unable to customize my installation. It seems to install every office app on system drive. What are the main differences between C2R and normal MSI setup? I am coming from office 2013 MSI setup and Microsoft toolkit > EZ Activator worked for its activation. How can I activate this 365?