Missing Add-ins (REVIT 2021)

[nicole3PW46]

Hi!

I do not know what add-in is Revit asking for my previous model to be visible in a new addition I am working on at the moment. Please see the picture attach. Thank you!

[barthbradley]

https://knowledge.autodesk.com/support/revit-products/learn-explore/caas/CloudHelp/cloudhelp/2020/EN...

[RDAOU]

@nicole3PW46 

As per the following article, Revit is out of date and requires updates

https://knowledge.autodesk.com/support/revit-products/troubleshooting/caas/sfdcarticles/sfdcarticles...