I see the latest build now accepts that 3DS Max Extension 1 is installed, however, it still does accept that Alias 2015 Product Extensiuon 1 is installed
It's getting better, but still not quite there yet
I am unsure if this is still an issue for you, but I wante dto get somethong out there for the community, for preople running into App manager errors.
This is the first year for the App manager and there have been some odd behaviors with some systems. This is why there have been updated versions over the year.
When I run into issues with the manager, I have users uninstall it and download the latest from this post:
Then update the manager first and let it fly. Usually a new install is what is needed. Not always, but usually.