How to upgrade moodle from 2.4.1 to Moodle 2.9.1+. Please help. Thank You.
Is it also work for windows server? Thank You.
Did you read it, https://docs.moodle.org/24/en/Upgrading#Standard_install_package, for example?
Warning: Read https://docs.moodle.org/24/en/Upgrading#Before_you_upgrade_your_site_for_real carefully!
Warning: Read https://docs.moodle.org/24/en/Upgrading#Before_you_upgrade_your_site_for_real carefully!
Yes, regardless of O/S and web server, procedure of upgrading is exactly the same. Just make sure your PHP and MySQL are up to mark for upgrading.
Always practice on a dev server which is set up the same way as the live server so you know exactly what will happen.