I see the page for Android Commander was updated just two months ago, but the developer's website, androidcommander.com, seems to be gone.
Is this application still supported?
No, the application is not maintained anymore. I have checked the official website as well, but it now redirects to something that has no connection with Android Commander. As an alternative, I can recommend you Wondershare MobileGo, which is practically the same thing and has the same functions as Android Commander: it manages files on Android and iOS phones.
Download it: http://mobilego.wondershare.com/