Dyn file doesn't open on old version(2019) of Revit after modified on recent version(2022)

[Brendan_Cassidy]

Check the dynamo error log once it is opened, to see this log follow what i describe in the following post

Monocle Package is not available in Dynamo 2.6 anymore

Have a look at the Dynamo Log , you can access this in dynamo by roughly moving the mouse to the red line area and clicking and dragging it up. Once visible, have a look for anything that has monocle within its name. [image]