When I first ran SDK manager it had loads of options to download, I installed API 15 and 10, I need the support package installed to start a new project and the only thing that shows up now are the currently installed packages. Nothing new shows up. I'm using repository 7. Any ideas?
My main concern is that after updating I can't start a new project because I'm missing the android support libraries, I can't get the support libraries because the downloader won't update the list.
I had the same problem, found the solution here: https://groups.google.com/forum/?fromgroups=#!topic/android-developers/wp8FFGmsgAQ
Clear your cache and reload. The clear-cache button is in Tools > Options in the SDK Manager, and reloading is Packages > Reload in the SDK Manager.