This guide is setup to help with issues encountered that block the upgrading of Revit models/families.
Background Info
Review the following help topics relevant to the versions you are upgrading to see changes that may impact the upgrade and upgraded project:
Initial Troubleshooting
Go through the following initial troubleshooting steps to try clearing the issue:
If you have the earlier version of Revit available:
Open the file using the Audit checkbox.
Save.
Ensure the newer version of Revit is also updated, and try upgrading again.
Copy/Save files being upgraded locally (to rule out network issues).
Open with worksets turned off for workshared models (this would prevent Revit links from loading, and introducing more work/errors).