Try this to get the latest insider ISO Insider Download Windows 10 Insider Preview ISO - Windows 10 Forums .

See if there is something in here that helps. Option #2 Insider Builds - Start or Stop Receiving in Windows 10 - Windows 10 Forums .

If you pull out of the insider program, you will go back to the last consumer build (version 1511/build 10586) since you started from a qualifying OS.