Cannot download artifacts using http://bamboo/browse/<plankey>-<jobname>/latestSuccessful/artifact/<artifactname>

I can get a page which contains the URL to the artifact for a Job in a plan using the following;

http://bamboo/browse/<plankey>-<jobname>/latest/artifact/<artifactname>

but sometimes the latest build has failed and not produced any artifacts. I found /latestSuccessful but http://bamboo/browse/<plankey>-<jobname>/latestSuccessful/artifact/<artifactname> does not work (404)