BIMcollab

The error message 'Revit cannot run the external application...' is most likely caused by Revit not being up to date. Could you please update Revit 2021? You can find the latest hotfix here: 

<a href="https://help.autodesk.com/view/RVT/2021/ENU/?guid=RevitReleaseNotes_2021updates_2021_1_8_html" target="_blank" rel="nofollow noopener noreferrer">2021.1.8 Hotfix</a><br>

Latest solutions: Revit cannot run external application

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