... what do you mean?
.... here are the REVIT 2019 extensions that have been released until today
... you don't need to use or try to use the 2018 version
Site Designer Extension
http://up.autodesk.com/2019/RVT/41C62077-385C-4F62-BDDA-D569BB912F77/RSD.msi
Infraworks to Revit Interoperability
http://up.autodesk.com/2019/RVT/B37636AF-1320-4F10-A49D-34C36BFB3291/IWExportToRevit.msi
DB Link
http://up.autodesk.com/2019/RVT/039D8DF6-DB75-4B68-A3A7-851188F62CCA/RDBL.msi
FormIt Converter
http://up.autodesk.com/2019/RVT/A0B38AB0-4772-4643-BD45-059AFF651FBB/FormItConverter2019_UPD.msi
Advance Steel Extension
https://up.autodesk.com/2019/RVT/ADD6994C-3DB1-4B65-87FD-9754920A78F4/RSCE2019.msi
Structural Precast Extension
http://up.autodesk.com/2019/RVT/498A582F-AE8F-44A7-A179-04B7C3D40BB6/RPRE.msi
Revit Extension for Fabrication
http://up.autodesk.com/2019/RVT/4D6FDE94-5961-4014-805C-91F3DB570FED/RevitFabricationExtension.msi
Roombook Areabook Buildingbook
http://up.autodesk.com/2019/RVT/FFC188F5-396E-4726-900E-8F64ABF15996/ABRB.msi
BIM360 Revit add-in
http://up.autodesk.com/2019/PLC0000002/3EB1D48F-7B6F-43B9-94C0-7B2D22112677/B3Addin_Revit2019_x64.msi
STL Exporter for Revit
http://up.autodesk.com/2019/RVT/31E6DA27-C476-4C09-877D-F24F561AF9D8/STLExporterForRevit2019.msi
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REVIT EXPERT ELITE
➪ ➪ ➪ ➪ ➪ ➪ ➪ ➪ ➪ ➪ ➪ ➪ ➪ ➪ ➪ ➪ ➪ ➪ ➪ ➪ ➪ ➪ is it working for you ? ➪ ⇩ 'Accept as solution' ⇩ ⇦