This is where you find it:
- Go to: https://accounts.autodesk.com/
- Sign in with your Autodesk username and password.
- Click Management
- Click Downloads
- Click Updates & Add-ons
- The Maya 2017 Update 2 is in that list
Click Browser Download
- Install the update
If you a Mac or a Linux user, you have to uninstall the whole Maya before the update.