Product location(s)

Samdim Design Group website (product page, scroll down in the left frame and click on the Il-86 image on the footer of the page. then click on the link "Ilyushin Il-86". the download page will be loaded in the right frame)
AVSIM Library (base pack, search for "ilyushin_il86.zip")
AVSIM Library (update, search for "update_il86_setup.zip")