Joomla
Before you begin, you should back up your Joomla directory folder on your FTP webserver and your MySQL database, so you don’t lose anything if the update fails. If you want to be extra careful, make a test site from your joomlabackup file and data base first and if the test site is fine after the updates, you can update your real site.
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1. Download the correct update package for your version of Joomla.
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For example, if you are using Joomla 1.5.10, you should download: Joomla_1.5.10_to_1.5.12-Stable-Patch_Package.zip
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2. Unzip the zip folder to your computer.
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3. Upload all the files to the root directory folder of joomla, and let your FTP client overwrite the old Joomla files.
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4. Login to your website and check if everything on your Joomla site is fine. The new version should be displayed on the upper right corner of the display screen.