When I open Dynamo 2.1， about 5s ，The program stops working as soon as it opens
Hello @BIMSEA …hello and welcome, very difficult to say…know it sounds silly but have you tried to restart ;)…IT Crowd - Have You Tried Turning It Off And On Again? [720p] - YouTube
I have restart system and computer , Even deleted the recently added node package , But Dynamo1.3 is Normal operation。 Just 2.1 &2.5 isn’t running。 
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Strange…for 2020 and 2021 it should come with the revit install…for other version : Highest #DynamoBIM Version for #Revit Versions
Here i think we need @jacob.small probably he had an idea 
When I click Dyanmo ， it doesn’t give me choice version 。So I can’t use other version。
No matter whether it is solved or not, I appreciate your answer.
For 2020 and 2021 2022 you cant change version it only support one version from the revit install…for 2017-2019 these version support two versions dynamo 1.3.4 and 2.0.4 where you can choice
I have install Revit 2016\2019\2020\2022 ，just 2016\2019 Dynamo can work .
I want to solve the problem because I’m worried that the subsequent node package won’t work.
And when isn’t runing, I found from the error report that it was related to the graphics card driver, and I updated the graphics card driver.
System Version : Windows 11
Think that tag was for me, so I’ll weigh in.
Post your logs and we can dig a bit, but first try disabling all Revit add-ins and Dynamo packages. Once you have done that the logs can be found at something like C:\Users\*username*\AppData\Roaming\Dynamo\Dynamo Revit\*X.Y*\Logs\
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