WLM2009 is the same thing as 9.0 which is the same thing as version 14.
Firstly, uninstall 9.0, then install
WLM 8.5 again.
If you have trouble installing 8.5 because your pc thinks 9.0 is still installed, then you can use
ZapMessenger to get rid of 9.0 then install 8.5