Please enter a valid URL. Protocol is required (http://, https:// or ftp://) in Magento 1.9.2 installing?

Resolve this issue by the following methods (from good to worse):

1) Inspect the url field and delete the class ‘validate-url’ to stop validation from the field and proceed the process.
have a good Luck guys.

OR

2) just mark the “Skip Base URL Validation Before the Next Step” checkbox.

OR

3) use 127.0.0.1 instead of localhost like
http://127.0.0.1/magento192/