Translations:Major version upgrade/3/en
From LimeSurvey Manual
How to prepare for a major version upgrade
To be on the safe side when performing an upgrade and be able to continue surveys with the least amount of interruption, we recommend first testing all your customized code on the new version of LimeSurvey you want to upgrade to.
This will require you to create a new application to test on, you can either create one through our cloud hosting:
https://www.limesurvey.org/
or host one up by yourself:
https://manual.limesurvey.org/Installation_-_LimeSurvey_CE