I have spent some 35-40 hours trying to upgrade this model file in the dropbox folder below. It is a native 2016 file that was created by a company the client has since sacked. Access to any backup files, recovery files etc is out of the question but I need this file to open in 2017 or later.
I've done quite a bit of a search already and purged this file of every workset and family file not in use, yet it continues to display the same error.
I was hoping someone here has a work around / solution or could open it with their Revit 2017+ software.
In the meantime I've exported it as an IFC and opened the IFC in 2017 to work on. This isn't ideal but serves for sections & elevations almost as well.
https://www.dropbox.com/sh/z6ddd30iat9k5jx/AAAqRwyj-p3i7CS-qH_QhIIqa?dl=0