Magento Upgrade from 1.4.0.1 to 1.4.1.0

Having recently upgraded a Magento installation from 1.4.0.1 to 1.4.1.0, I know how drastically things can go wrong. I have now completed a new upgrade and here is how to successfully upgrade Magento from version 1.4.0.1 to 1.4.1.0:

  1. Back up your 1.4.0.1 database
  2. Create a new empty database for 1.4.1.0
  3. Upload the 1.4.0.1 database to the new 1.4.1.0 database
  4. Download, unzip and upload Magento 1.4.1.0 to a new folder on your server
  5. Visit the folder using your browser and install Magento using the new database which contains the old 1.4.0.1 data. This process will take a long time to go make a coffee.
  6. Enter your login credentials and transaction key (the same as the old 1.4.0.1 install) and finish the new installation.
  7. Test everything works as expected in the new 1.4.1.0 install.
  8. You are now ready to go live with the new install so just change folder names, etc to use the new folder containing the new Magento install.
  9. Drink the coffee because it's now getting cold.