2021.1.2 Hotfix

The Revit 2021 updates and hotfixes are cumulative and include all changes from previously released Revit 2021 updates.

After this hotfix is applied successfully, the build number specified on the Help > About dialog will be:

Software embedded in the update executable:
Revit 2021 - version 21.1.20.44
Revit Unit Schemas 2021 - version 21.1.20.44
Steel Connections Content for Dynamo 2021 - version 2.6
Cloud Models for Revit 2021 - version 21.1.20.44
Generative Design for Revit 2021 - version 21.11.1.0
Personal Accelerator for Revit - version 22.0.1.0
OpenStudio - version 0.1.17

Issues Resolved

Annotation - Tags
Improved the stability when selecting material tags in 3D, section, or elevation views.
DirectShape Elements
Improved Massing instances imported from FormIt to dimension properly.
Energy - Analytical Model
Fixed an issue that caused systems analysis to fail if an analytical surface is created without a valid analytical space reference.
Export DWG/DXF
Improved the stability when exporting to DWG in a location synced to a cloud storage service.
Fabrication - MEP
Fixed an issue with elevation tags that would display ? when removing the leader from the tag.
Fixed an issue where thousand of combination was causing Revit to freeze during a reload configuration.
Family
Fixed the issue that families cannot be loaded if they are accompanied by a type catalog where types are separated by blank lines.
File Open/Save
Improved stability for model open when a registry item is lost.
Help
Fixed the issue that F1 keys do not display the correct help page in browser.
MEP Electrical Cable Tray and Conduit
Fixed an issue that caused cable tray fittings to not display in a plan view with annotation scale turned on.
MEP Electrical Circuits
Improved stability when creating a circuit in system browser after delete a circuit in canvas.
MEP Mechanical Other
Fixed an issue that caused a hosted element to move when its workset changed.
MEP P&ID Modeler
Allow user to associate a BIM 360 Plant Project on BIM 360 Docs via P&ID modeler when the model was originally associated with a Plant Project on A360 Teams.
Revit Cloud Worksharing
Fixed an issue so that sync with central would not be blocked by the long file path of a linked file in a cloud model or a Revit Server model.
Fixed an issue that a cloud model with name length close to limit 255 causes failure of navigating to the corresponding folder on Import/Link RVT dialog.
Fixed an issue when the Worksets are not editable task dialog is shown, when there are 2 users, both of whom created new worksets and edited their respective worksets, and then performed a SWC respectively, causing a Workset clash due to new worksets being downloaded into their locals during SWC.

Important Notes

Content
Updated Content for Revit 2021.1 is not included in the patch deliverable and is provided on the Autodesk Knowledge Network, link.
Update installation may fail if the original Content path location is not accessible.
Install
After applying the hotfix, Generative Design command may cause "RestDynamoCore.exe - This application could not be started" errors. A reboot of the system should resolve the errors.

In some scenarios the original RVT.msi may be required to install the hotfix. If you are prompted to specify the RVT.msi version and do not have access to the original installation files you may download the RVT.msi as follows. There are several unique Revit 2021 full product installers which have been released and each includes a unique version of the RVT.msi file. The following is the simplest way to identify which full product installer was used to install Revit 2021 on a workstation:

  1. Open the Windows Registry Editor.
  2. Browse to and select the HKEY_LOCAL_MACHINE\SOFTWARE\Autodesk\UPI2{7346B4A0-2100-0510-0000-705C0D862004} registry key in the left column.
  3. In the right column, make note of the BuildNumber value.

If the BuildNumber is 21.0.0.383, then the installation used the initial Revit 2021 full product installer and the required RVT.msi is available here: link

If the BuildNumber is 21.1.1.109, then the installation used the Revit 2021.1 full product installer and the required RVT.msi is available here: link

If the BuildNumber is 21.1.11.27, then the installation used the Revit 2021.1.1 full product installer and the required RVT.msi is available here: link

Uninstall
Revit 2021 updates can be uninstalled to revert Autodesk Revit 2021 to its pre-update state.
Uninstalling this update after being applied to a Revit 2021.1 installation may require the original installation media to complete without error.
Uninstalling this update after being applied to a Revit 2021.1 installation may cause the Revit version displayed in Windows>Add/Remove Programs to be blank.