You must use the command line to install Magento 2.4.x.

Open the terminal and execute command :

setup:install --base-url=http://localhost/magento240/ --db-host=localhost --db-name=magento240 --db-user=[db_username] --db-password= --admin-firstname=admin --admin-lastname=admin --admin-email=easyndfaster@gmail.com --admin-user=admin --admin-password=Admin@123 --language=en_US --currency=USD --timezone=America/Chicago --use-rewrites=1 --search-engine=elasticsearch --elasticsearch-host=localhost --elasticsearch-port=9200 --search-engine=elasticsearch