Jira Rest Java Client (JRJC) can't update the existing issue for the dependency JRJC2.0.0-m25

I was working with jira-rest-java-client-api-2.0.0-m25.jar and jira-rest-java-client-core-2.0.0-m25.jar to create a JRJC tool.
I faced an issue with your IssueRestClient api with this version.
I can’t update an existing issue as there is no such function/method defined anywhere in your class where as it is present there for the other versions like the latest ones.
With this m25 version the issue is ,instead after setting the desired field values it will create another new issue with createIssue(IssueInput) method.
Now I have tried working with the latest other versions as well but due to dependency issue I was not able to make my code work with other versions like jira-rest-java-client-api-4.0.0 apart from the mentioned one.

Hence I need something which will make my issue update the current/existing one without creating a new issue with this m25 version only

Kindly help me out.
I’m stuck with this…