Ranger, the Wiki is not up to date, nor accurate for the current MLHAI beta. It's on the to do list. Always download via MLInstaller and use that most current version.
Since you might have the first generation plugin, uninstall the plugin before installing the latest.
Install using MLInstaller all components to be sure you are using the latest.
I edited the Wiki for the current versions (but most of the rest of the MLHAI wiki is not accurate)