Download of RBXLegacy 1.18.1 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program's installer file is commonly found as RBXLegacyLauncher.exe. The most popular version of the RBXLegacy is 1.1.
RBXLegacy is suitable for 32-bit versions of Windows XP/Vista/7/8/10/11. This free program is an intellectual property of Bitl. We recommend checking the downloaded files with any free antivirus. The software lies within Games, more precisely Utilities.
From the developer:
RBXLegacy is a multi-version ROBLOX client based on RBXPri scripts that can play LAN and online servers. This also includes support for adding more clients, randomized body colors, and more! This includes the clients by themselves so you do not need to download them separately.
You may want to check out more software, such as CEP - Color Enable Package, Scriptorium for TS2 or Razer Diamondback, which might be similar to RBXLegacy.