ISO previous windows phone 8.1 builds which has Astoria

I am looking for windows phone 8.1 mobile builds which has Astoria in it , I have a verizon 735 right now running on windows 10 . i wanna go back to 8.1 and restore with the build which has astoria in it . Is it possible ? Please advice . Thank you

from Windows Central Forums https://ift.tt/2yxcwzi
via IFTTT