“The new actuators are incredible. I built a fully functional spider-walker in two hours. However, the game crashed three times while saving. Worth it for the features, but keep hitting Ctrl+S.” –
Generally, no. Most mods are designed for specific stable versions and will break or cause conflicts in the beta. dynablocks.beta download
Since the original 2004 software is not officially available from Roblox Corporation today, most current "downloads" are fan projects or simulations: Dynablocks Basics (Mod): A popular fan-made mod available on that simulates the 2004-era look and feel. In-Platform Simulations: “The new actuators are incredible