Make a full copy of your site´s files and your database content as described in Upgrading General before doing any actions.

Find and download a new copy of your locale , for minimum PHPFusion 8.00.xx in the Translations

Extract these files and replace all your current locales in your /locale folder

Once you have completed this step, download PHPFusion 8.00.xx

Extract your files
Find the upgrade file in Upgrade_8.00.xx-8.00.xx
Copy the file upgrade.php to your administration folder and replace current file.
Go to your administration > system admin select the upgrade icon, it should say that a new major upgrade is available.
Push the upgrade button and wait for your new config. When the config data is displayed, save the content that are shown in a text file on your desktop.

At this point your site will not work.
You need replace all your old files on your server with the files from the downloaded pack.
Once this is done, open your config and replace the content with the new generated content you have.

If you have questions or run in to trouble, please visit our Upgrade Support Forum.