Zoho Workdrive for Office, "vsto runtime not found"

Zoho Workdrive for Office, "vsto runtime not found"

Hi all,

I have been trying to get ZohoWorkdrive_MS-addin_1.4.exe installed, but I keep getting the error "VSTO Runtime Not Found!" - even though I have installed it ...

Anyone else hear had problems with the MS addin?  FYI, I am using O365 on A Dell laptop running Win 10 Home - fully patched and up-to-date.  I have tried compatibility modes and running explicitly as Administrator - the usual steps.

Any advice would be appreciated.