Version 1.8.9 usually requires Java 8 . Ensure you have the correct version installed if the client fails to launch. ClientPlayground/Arial-Client: 1.8.9 | Version 1.1 - GitHub
Upgrading to version 1.8.9 ensures access to the latest features, critical security patches, and improved stability. It also future-proofs your setup by aligning with our upcoming API updates. File name- Arial-Client-1.8.9.zip
Launch Minecraft 1.8.9 and select the pack/client from the in-game settings menu. Cautionary Note Version 1
: Allow users to move and resize elements like the CPS Counter , FPS Toggle , and Keystrokes directly on the screen using a simple GUI. critical security patches
Conclusion should encourage users to upgrade and mention support channels. Also, note that the ZIP file is a downloadable archive.