oh hi i've been looking for 2.0.0.0.0 to 2.0.0.0.9 could anybody help me?. have downloadet about 10 diff. versions but none of them works:c

okay so i've been wanting to start speedrunning l4d2 but i cant seem to find the rigth vers wich is about 2.0.0.0.0-2.0.0.0.9. anyone that could help?