We need a clarification. If we buy license for a version of jira enhancer plug-in, will it be a one time cost
or do we need to pay annually for the plug-in to work with out any issues. Please assume that we don't migrate
to new versions of Jira and plug-in.
You need to renew your license every year for support and maintenance in order to get updates.
With a license, you can get every updates yearly, on the other hand renewing a license in the following years is about half priced.
You can see every details about marketplace licensing in Atlassian's FAQ section http://www.atlassian.com/licensing/marketplace