Steps: 1. Backup your existing database 2. Execute upgrade.sql script over your database 3. Remove all files from the previous version except App_Data\Settings.txt and App_Data\InstalledPlugins.txt 4. Upload new site files 5. Copy back App_Data\Settings.txt and App_Data\InstalledPlugins.txt files 6. Ensure that everything is OK Notes: 1. If you stored your pictures on the file system, then also backup them (\Content\Images\) and copy back after upgrade