how can I run Dynamo 2.1 in Revit 2021?

[20202109010]

Dynamo 2.5 is installed on Revit 2021 but I want to work on 2.1 because of some package.

I found out 2.1 is already installed in my computer but how can work on 2.1

[architect.bim · Accepted solution]

Is is impossible. Since Revit 2020 Dynamo is automatically installed as part of Revit and you are unable to change its version. If you need lower version of Dynamo - you should use lower version of Revit.