Wow, greenhopper is old
It was acquired by Atlassian many years ago, rebranded as "Agile" for a long time, then "Software" and with JIRA 7, has now been changed into an application for JIRA, but still called "Software"
You will be able to upgrade from JIRA + GH to JIRA Software but you will need to stage it through several versions of both JIRA and GH/Agile/Software, and be aware that both products change a lot through those versions.
What are the current versions of the software? GH stopped being GH sometime in JIRA 3's lifetime, so I imagine you're on JIRA 3.something-low, but rather than guess, could you confirm where you're starting from?
Hmm, then the add-on should be called "Agile" by now. Greenhopper went away in 3 or early 4.
Anyway, yes, you should upgrade to JIRA 6.4 + Agile (highest available version), then you can go to JIRA Software - given there are some problems with going straight to the latest version, I'd go for 7.0.highest of JIRA and it's related Software version, then 7.2
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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