There is no official in the traditional desktop OS sense. Android is not distributed as bootable ISO files for PCs; it was designed for mobile devices (like the HTC Dream / T-Mobile G1).
Sites like Internet Archive and various GitHub repositories host "ported" versions of the that have been modified to run on VirtualBox or VMware. These are not official, but they are functional recreations. Android 1.0 Iso
Open a terminal or command prompt inside the tools/ path directory. There is no official in the traditional desktop OS sense