Install problem with ProStructure Object Enablers x64 for AutoCAD 2017


We have recently updated to AutoCad2017 and needed to update Object Enablers for AutoPLANT and Prostructures to continue using legacy drawings.

AutoPlant installed okay however Prostuctures will not install and states that AutoCad 2016-2017 is not installed.(see attachment)

Any suggestions would be appreciated.