Beta 5 with support for UE 4.4 has been added! This took much longer than usual due to a recent personal event (cross country move) but things are back and ticking with a brand spanking new website as well.
Existing customers: go to the new website and login to your account. You should have received an email with your new login information. If not please contact me. You should see SDK Beta 5 for UE 4.4 available for download under your purchased products.