So it seems that an update to the game recently broke the asl connected with livesplit, but there is one here that should work: https://www.dropbox.com/s/p2drvbqqttwkgw0/mw2rnew.asl?dl=0

If for some reason you run into issues with that, there is a simple load remover that you can try here: https://www.dropbox.com/s/3krfj48yq1y3bsx/mw2r.asl?dl=0

Any runs done on pc should be timed with these.