May 20, 2021 – Autodesk released the Autodesk Civil 3D 2020.5.3 Update
The Autodesk Civil 3D 2020.5.3 Update is available via the Autodesk Desktop Connector app or via download from the Autodesk subscription site.
The update requires access to the original install resources and the Civil 3D 2020.1 Update were previously installed.
Autodesk Civil 3D 2020.5.3 Update
Autodesk Civil 3D 2020.5.3 Update addresses an issue in which Civil 3D would lock up (and the DWG file would become read only) when saving a source drawing with a shared data reference. The issue was caused by multiple Civil 3D sessions trying to read the data shortcut source drawing while it was being saved in another session.
Please make sure the system variable DataShortcutsSourceCheck is turned off (set its value to 0) in Civil 3D on every computer working on the same project.
Note that when the system variable DataShortcutsSourceCheck default value is set as 0, a notification will be displayed in the host/consumer drawing whenever the source drawing is saved, even without any entity/geometry change.
Read the Civil 3D 2020.5.3 Update notes in the Civil 3D 2020 on-line Help