Am stuck at build 10166 and am unable to update to the latest build.. Is there any iso link available for downloading it?? Thank you
Wasn't 10166 a mobile build? If you're talking mobile, you need to roll back to WP8.1 in order to move to the latest build.
If you're talking desktop, then the original 10240 RTM is available as ISO and you can get to the latest preview from there.