steps:
- EXEC: Ctrl + 3 and provide "Runtime" into the filter field, choose Download Runtimes
- EXEC: choose CDK v3.3.0, hit "Next"
- ASSERT: credentials page shows up
- EXEC: provide credentials, hit "Next"
- ASSERT: license page shows up
- EXEC: accept it, hit "Next"
- ASSERT: "Download Runtime" page shows up
- EXEC: confirm suggested values, hit "Finish"
- ASSERT: download is triggered, is progressing.
Result:
Once the download is finished, an error shows up:

If you verify the destination, you see that it's actually a file (while the dialog talks of a folder):
$ ls -l cdk-3.3.0-1-minishift-darwin-amd64
-rwxr--r-- 1 adietish staff 461M Mar 21 14:52 cdk-3.3.0-1-minishift-darwin-amd64
{"errorMessages":["jqlTooComplex"],"errors":{}}
[{"id":-1,"name":"My open issues","jql":"assignee = currentUser() AND resolution = Unresolved order by updated DESC","isSystem":true,"sharePermissions":[],"requiresLogin":true},{"id":-2,"name":"Reported by me","jql":"reporter = currentUser() order by created DESC","isSystem":true,"sharePermissions":[],"requiresLogin":true},{"id":-4,"name":"All issues","jql":"order by created DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false},{"id":-5,"name":"Open issues","jql":"resolution = Unresolved order by priority DESC,updated DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false},{"id":-9,"name":"Done issues","jql":"statusCategory = Done order by updated DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false},{"id":-3,"name":"Viewed recently","jql":"issuekey in issueHistory() order by lastViewed DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false},{"id":-6,"name":"Created recently","jql":"created >= -1w order by created DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false},{"id":-7,"name":"Resolved recently","jql":"resolutiondate >= -1w order by updated DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false},{"id":-8,"name":"Updated recently","jql":"updated >= -1w order by updated DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false}]
0.3
0
Closing in favor of the new issue.