
Fortunately, there is a straightforward workaround:
1) If you’ve already installed Office, then uninstall.
2) Download and install the free evaluation copy of Microsoft Office from the link below:
http://technet.microsoft.com/en-US/evalcenter/jj192782
3) When prompted to activate on first run, select Organizational Account instead of Product Key and enter your Office 365 e-mail address and password.
Because the evaluation download does not use click-to-run, you can now use your licensed copy of Office as part of Office 365 and install the Salesforce plugin.
