There is a problem with the installer that prevents APLNext from installing under the Team Edition of Visual Studio 2005. You can either wait for the next beta version of the installer, which should have this fixed, or try the workaround below that involes a temporary modification to your Windows Registry. In the Registry branch below, change the "VSTD" key to "Std":
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\8.0\Setup\VS\VSTD
then run the APLNext installer.