Go to the marketplace on your client machine at http://marketplace.atlassian.com/ find the add on, look at the versions list to identify a compatible version, download that, then connect to your server and go to Admin -> manage add-ons, look for the "install add-on" link and feed it the file you downloaded.
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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