Microsoft no longer offers this build directly via their standard media creation tool. You must use one of these two methods.
Windows 10 Version 1511, codenamed "Threshold 2" (TH2) , was released on November 12, 2015 . It was the first major feature update for Windows 10, transitioning the operating system into the "Windows as a Service" model. 1. Key Technical Specifications Version Number: 1511 (indicating November 2015 release). Base Build Number: 10.0.10586. Architecture Support: x86 (32-bit) and AMD64 (64-bit). Final Build Revision: 10.0.10586.1540. 2. Significant Features & Improvements windows 10 version 1511 build 10586 iso