So I tried the latest version (19.0) and same result. I also tried the alpha version that is available (19.0.2) it also lead to the same result, which was a blue wheel for a few seconds then nothing.
I really don’t want to do a complete format…but seems to be less and less options.
BTW I was able to download and run Dynamo 2.4 Sandbox first try on an old laptop I had at the office, so seems to be localized to my current workstation (laptop)
Same here. Dynamo sandbox 2.4.0 not running after download. Dynamo 2.3.0 has no startup problems. Unblock zip, extract to desktop etc, nothing happens. W10x64 1809
I am not sure yet, we are investigating, but I think it may have something to do with other products which use Dynamo like civil3d, Revit, Robot etc in conjunction.
You should be able to simply rename these folders to stop dynamo from being effected by these but that is just a guess at this point - I will post back here when we know something conclusive.