You can install Aristois using an automated installer or by manually placing the .jar file.
A paid "Donor" version exists, offering extra features and exclusive modules as a thank-you for supporting the developers. Aristois-Free.jar
While some third-party sites may host malicious files, the versions from Aristois.net are generally considered safe by the community and developers. You can install Aristois using an automated installer
Open your Minecraft launcher and select the newly created Aristois profile before clicking play. Safety and Ethics Aristois-Free.jar
If using the zip file, extract the contents into your Minecraft versions folder, typically found in %appdata%\.minecraft\versions on Windows.
How To Download & Install Aristois Client for Minecraft 1.21.11