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Here's a quick overview of how to upgrade an existing installation of Hotaru CMS: If you'd like to upgrade via Subversion, instructions are here (needs link).
Looking for installation instructions? See Installing Hotaru CMS.
Be careful not to overwrite customizations! Read this first: File Organization
Note: After upgrading you may need to do a hard refresh (CTRL + F5) and/or clear the language cache from Admin -> Maintenance.
If you're having trouble upgrading Hotaru, please post your questions with as much detail as possible in the Installation and Upgrades forum.