I cannot find google app engine (in choose platform option) when i try to install ODK aggregate

What is the problem? Please be detailed.
I cannot find google app engine (in choose platform option) when i try to install ODK aggregate
What ODK tool and version are you using? And on what device and operating system version?
I am using Windows

Anything else we should know or have? If you have a test form or screenshots or logs, attach here.

In Upcoming changes to Aggregate we explain that we are removing support for AppEngine starting from Aggregate v2.0.0.

If you need to deploy Aggregate on AppEngine, you need to use v1. The latest version of that major version is v1.7.1