Is the plugin even still around? I don't have any backups of it lol. If there was an update to the source engine then it probably won't even work 
EDIT
Had a quick look at HL2: DM updates, there has been quite a few this year one of them being some changes to plugins so probably won't work

EDIT
Had a quick look at HL2: DM updates, there has been quite a few this year one of them being some changes to plugins so probably won't work