It is not possible to installed on the same PC Unity Pro V11.1, V13.0 and V13.1 and the EFB Toolkit V8.0 or V8.1

Unity Pro V11.1 / V13.0 / V13.1 and Unity EFB Toolkit V8.0 or Unity EFB Toolkit V8.0 SP1 cannot be installed on same computer.
This will not be fixed in further release of EFB Toolkit.
For Control Expert V14.0 and gretaer version it is mandatory to install Unity EFB Toolkit V14.0
This information can be found inside the UP release note for Unity EFB Toolkit V8.0 but this is also true for Unity EFB Toolkit V8.0 SP1

Released for: Schneider Electric USA