Installing osCommerce v.4.0
Upload the installation onto the web server, and unpack it.
Then open the web server URL in the web browser.
After reviewing the license agreement click on the Accept and Start Installation button.
Make sure your website (Current column) meets the following server requirements (Recommended and Required columns) and click on Proceed button.
Fill in the required fields and click on Install Database button.
If the database is not empty the following error will show up. Check the box next to Delete data and continue installation option and click on Retry button.
Fill in the required fields and click on Update Database button.
Fill in the required fields and click on Create access to create the administrator account.
Pass the recaptcha and click on Complete Installation button.
The system will redirect you to the same front end.