When running the installer it may tell you that you require a valid installation of Microsoft Office. This usually happens when the customer has installed the Outlook App from the Microsoft Store rather than installing the desktop version of Office. Installing the desktop versions of Office ensures you get the full functionality and are able to install eFiler. If you have the full versions installed you will find the shortcuts will point to a folder/sub folder in one of the follow paths –
C:\Program Files (x86) – where Office 32 bit is installed
or
C:\Program Files – where the 64 bit version of Office was installed