The package installer is a core package and has nothing to do with the actual AD Provider itself. What I mean is getting a javascript error on install has nothing to do with the provider and whether it works with DNN 4.9.0 or not.
Any number of things can cause a javascript error. Could you post what the error is? I'll try to replicate it on one of my installs.
BTW, yes the provider is supported in the 4.9.0 version of DNN.