The leader10e.zip file you have requested: Tools and Utilities / Misc / Bot Leader v1.0 - 41.4kb is not available. Perhaps try browsing all files for the game Half-Life and upload any files you want to share or are missing. This is the only information we could locate:
Bot Leader (a bot launching utility) version 1.0 for Half-Life. Visit Quake.quipo.it for more info.