How do you make addons that work on version 2.3.1 to work on 2.5.1

How can I make addons that worked on version 2.3.1 to work on version 2.5.1?
Any idea?
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How can I make addons that worked on version 2.3.1 to work on version 2.5.1?
Any idea?
Comments
There is no standard answer. Please go to the plugins download page, click "Ask a Question" and give a detailed description of what is broken
@prosper - see the latest discussion note plugin source for some hints...
these might help you in a general way
https://open.vanillaforums.com/discussion/35722/for-plugin-authors-changes-of-interest-in-version-2-5
https://open.vanillaforums.com/discussion/34126/any-plugin-conversion-tool-available-necessary-for-vanilla-2-5
you will probably need to read them carefully and experiment as needed.
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