The bsp_pb2_build015b.zip file you have requested: Modifications / Paintball / Map Making / BSP with Paintball2 Support - 2.88mb is not available. Perhaps try browsing all files for the game Quake 2 and upload any files you want to share or are missing. This is the only information we could locate:
This includes BSP along with all the necessary .wal textures, compilers, and anything else you need to get started. Extract to C:BSP. See included install text for details.