Thanks Johannnes. I accept that I cannot open those drawings in AutoCAD 2016 now. So what is the latest version of AutoCAD that IS supported for AutoPLANT and ProStructures (64bit)? I must revert to that version. Is it AutoCAD 2014? And also, please, where to get those object enabler downloads suitable for the latest version that does have object enablers for AutoPLANT and ProStructures (64bit). I can't find any object enablers in the free downloads since AutoCAD2012. Thanks, Joanne
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