Cannot install Bizagi modeler 3.4

When trying to install Bizagi modeler on a new laptop running Windows 10 with latest update - I get the error message 1618 Another installation is already in progress. Complete that installation before proceeding with this install.

I haven't got any other installation in progress, there is no previous Bizagi installation on this laptop, I've rebooted laptop, checked and cleaned registry, ran installer as administrator, checked my .net version which is up to date, I run Internet explorer 11 - all to no avail.

Any help would be greatly appreciated.