This is where you find it:

1. Go to: https://accounts.autodesk.com/
2. Sign in with your Autodesk username and password.
3. Click Management
4. Click Downloads
5. Click Updates & Add-ons
6. The Maya 2017 Update 2 is in that list
   Click Browser Download
7. Install the update

If you a Mac or a Linux user, you have to uninstall the whole Maya before the update.

Cheers, D