The jbl05.zip file you have requested: Modifications / Bots / The Jumbot Launcher - 2.21mb 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:
The Jumbot Launcher (JBL) is a program designed to make customising the Jumbot, a halflife mod, very easy. The mod itself is quite complex and because of this uses over 30 console variables, also known as cvars, to control itself.