The pbsetup.run file you have requested: Tools and Utilities / Other / PBSetup: Linux Version - 1.53mb is not available. Perhaps try browsing all files for the game America's Army and upload any files you want to share or are missing. This is the only information we could locate:
EvenBalance has begun an open beta test of a new application for use in manually installing and/or updating PunkBuster software. "PBSetup" will update PunkBuster for all PB enabled games. This program is designed to completely replace the outdated PB This is the Linux version of PBSetup which will update PunkBuster for all PB enabled games.