The q3build108_b4.exe file you have requested: Tools and Utilities / Tools / Q3 Build v1.08: Beta4 - 1.91mb is not available. Perhaps try browsing all files for the game Quake III Arena and upload any files you want to share or are missing. This is the only information we could locate:
Q3 Build is a compiler front end for helping you compile your Quake III Arena maps. Its a GUI that writes and executes a batch file and can launch Quake3 for you.