also the first race challenge is bugged. I've beaten 36 seconds multiple times and it still wont allow me to progress
here is a bunch of run maps in old repo. download them and place to the folder where your config.cfg located (Rexuiz\data on windows, ~/.rexuiz/data on Linux or OSX)
http://nexuiz.trafflow.com/nr_4d_nex_driving_stunts_nolaser.pk3
http://nexuiz.trafflow.com/nr_aggressor.pk3
http://nexuiz.trafflow.com/nr_asplode_v1r1.pk3
http://nexuiz.trafflow.com/nr_bouncy_v1r3.pk3
http://nexuiz.trafflow.com/nr_caverun_v1r1.pk3
http://nexuiz.trafflow.com/nr_caverun_v1r1_src.pk3
http://nexuiz.trafflow.com/nr_caverun_v1r2.pk3
http://nexuiz.trafflow.com/nr_cb_race1.pk3
http://nexuiz.trafflow.com/nr_cel_hell_v1r2.pk3
http://nexuiz.trafflow.com/nr_crystalrun_v1r4.pk3
http://nexuiz.trafflow.com/nr_czsk3_v1r1.pk3
http://nexuiz.trafflow.com/nr_dead_v1r1.pk3
http://nexuiz.trafflow.com/nr_dead_v1r2.pk3
http://nexuiz.trafflow.com/nr_dibrun3.pk3
http://nexuiz.trafflow.com/nr_dibrun4.pk3
http://nexuiz.trafflow.com/nr_factory.pk3
http://nexuiz.trafflow.com/nr_fruitsrun1_v1r1.pk3
http://nexuiz.trafflow.com/nr_grid_in_space_v1r1.pk3
http://nexuiz.trafflow.com/nr_grid_v1r2.pk3
http://nexuiz.trafflow.com/nr_horizontal_velocity_v1r1.pk3
http://nexuiz.trafflow.com/nr_mech_escape_v1r1.pk3
http://nexuiz.trafflow.com/nr_ninja-pit_v1r2.pk3
http://nexuiz.trafflow.com/nr_pads_v1r3.pk3
http://nexuiz.trafflow.com/nr_piece-o-cake.pk3
http://nexuiz.trafflow.com/nr_quickieclimb_v1r4.pk3
http://nexuiz.trafflow.com/nr_quickierun1_v1r2.pk3
http://nexuiz.trafflow.com/nr_quickierun2_v1r1.pk3
http://nexuiz.trafflow.com/nr_ramps-cluttered_v1r1.pk3
http://nexuiz.trafflow.com/nr_random_v1r1.pk3
http://nexuiz.trafflow.com/nr_subway.pk3
http://nexuiz.trafflow.com/nr_tasty_vanilla_v1r5.pk3
http://nexuiz.trafflow.com/nr_terminal.pk3
http://nexuiz.trafflow.com/nr_terminal_v2r1.pk3
http://nexuiz.trafflow.com/nr_tunnel_v1r6.pk3
http://nexuiz.trafflow.com/nr_vert_v1r2.pk3
http://nexuiz.trafflow.com/nr_weisswurst_crutches_v1r2.pk3
http://nexuiz.trafflow.com/nr_xrun_v1r1.pk3