Thank you for using Bitnami. This page in our documentation shows how to upgrade the application to a newer version. It basically consist of installing the new version and migrating the data from the old version to the new one
You will probably find compatibility issues when migrating the data. The plugins or themes you have might not be compatible with the new version you want to use. You will need to review the Redmine's pages to know if there is any problem with any of the plugins you have and ask in the Redmine's forum to know more about possible alternatives.
Happy to help!
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