Jenkins move from rolling release to stable (LTS) release
From https://wiki.jenkins-ci.org/display/JENKINS/LTS+Release+Line :
Back up your Jenkins installation (for example the entire Jenkins directory)
Download desired jenkins.war version, in this case LTS one
Shut down Jenkins
Copy new jenkins.war over the old one in you Jenkins directory
Start Jenkins again
Follow this quote from above wiki page:
If you had a Latest&Greatest release running before and now have switched to LTS, you should open Manage Jenkins->Manage Plugins->Advanced and press "Check now". This way you ensure to get the proper update notifications for LTS and LTS-compatible plugins instead of Latest&Greatest. After you do this you may need to remove the contents of ${JENKINS_HOME}/updates to ensure that Jenkins shows the correct updates for the LTS stream.