The sbx2142_beta2.zip file you have requested: Modifications / Sandbox2142 / Sandbox2142 Beta 2 - 6.37mb is not available. Perhaps try browsing all files for the game Battlefield 2142 and upload any files you want to share or are missing. This is the only information we could locate:
Manual Installation: If you already have a sbx2142 directory in Battlefield 2142mods, delete it. Then, extract this to your Battlefield 2142mods directory. To play, activate the mod in Custom Games and then create a new local game This new version is based on the latest BF2:Sandbox core (0.4a) so all the features work just like BF2:Sandbox, except for loading/saving.