I have a 2019 project model I'm trying to detach and update to 2020, but when I try to detach and audit, I get the missing too many elements and cannot open error. I followed this: http://help.autodesk.com/view/RVT/2017/ENU/?guid=GUID-9AFAAE6B-4107-4478-8B80-53467FE118DB but it appears the only solution is to use backup files, but the ones I have, have the same problem. I can open the model just fine in 2019 - can't I do something with it opened to fix this?
Sounds like it's corrupted beyond repair. No backup? That sucks.
See if you can Link it into a new Project and Bind it.
Typically when you cannot audit or upgrade a model (but it otherwise opens normally) this is an indication of a corrupt family or families within the model. Try the following steps to search for, and correct, any corrupt families within your project model.
If you reload and overwrite them with clean copies of the original families from a company set of standards, it will remove the corruption within the model that's preventing you from auditing the model, and ultimately upgrading it. Reloading the family will prevent a loss of data & information. The other solution, if you don't have access to the original family, is to delete the family from the model altogether.
Also, please see this Autodesk Knowledge Network article about what causes data corruption and what you can do to minimize the possibility of it happening again.
BEST PRACTICES: PREVENTING DATA CORRUPTION IN REVIT
https://help.autodesk.com/view/RVT/2020/ENU/?guid=GUID-CE42D9A5-A1F9-47D0-9F25-B338DC74AC38
It's essentially the same process as outlined in the Solution section of this AKN article.
https://knowledge.autodesk.com/support/revit-products/troubleshooting/caas/sfdcarticles/sfdcarticles...
Also, below are a few links to some additional resources to help troubleshoot a corrupt Revit model.
Autodesk University 2017 - BLD125158 - Code Blue Dr Revit - How to Resuscitate Corrupt Revit Models - Presentation
http://bit.ly/2BQ38qe
Handout from my co-presentation and Datasets
https://1drv.ms/f/s!AmO3IjYenWEdhPYvoPS5MKqY9aSjeQ
Matt Wunch
Revit Subject Matter Expert/sUAS Pilot
Twitter | LinkedIn
AU2017 - Code Blue Dr Revit - How to Resuscitate Corrupt Revit Models
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