Magento Please enter a valid URL. Protocol is required (http://, https:// or ftp://)

Please follow the below step for SOLUTION:

1. Open \app\design\install\default\default\template\install\config.phtml

2. Find the textbox where the base url is entered. It will be around line no 85 with name ‘config[unsecure_base_url]‘

3. Remove ‘validate-url’ from its class and save the file.

4. Now you can continue follow the installation.

Enjoy!