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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:
- Back up your 1.4.0.1 database
- Create a new empty database for 1.4.1.0
- Upload the 1.4.0.1 database to the new 1.4.1.0 database
- Download, unzip and upload Magento 1.4.1.0 to a new folder on your server
- 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.
- Enter your login credentials and transaction key (the same as the old 1.4.0.1 install) and finish the new installation.
- Test everything works as expected in the new 1.4.1.0 install.
- 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.
- Drink the coffee because it's now getting cold.