The latest version of WildFly Application server – as of August 2022 – is version 27.0.0.Alpha4.
You can download the latest version of WildFly from the official site: https://www.wildfly.org/downloads/
Alternatively, you can use the Galleon tool to install the whole distribution or some specific layers. To learn more about it check this article: Provisioning WildFly with Galleon
Finally, you can get WildFly master branch with latest changes from Github: https://github.com/wildfly/wildfly and build it with: