GoogleAppEngine Python installation can't find .dmg file - installation

I downloaded the Google App Engine SDK for Python from here, extracted the zip file, but there's no dmg file that allows me to install it. Here's what the ReadMe says:
INSTALLING ON Mac OSX
=====================
1) Download and install Python 2.7 from http://www.python.org/download/
2) Download the SDK installer from
https://developers.google.com/appengine/downloads
3) Install the SDK by double-clicking on the GoogleAppEngine.dmg file and
running the installer.
I checked every folder but there is no such file! Maybe the ReadMe is obsolete. Please help..

Never mind. I didn't click the button--thought it was just a check image.

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Qt installation on mac OSX gives error Cannot open script file

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Another way to fix most Qt installer problems is to open https://download.qt.io/ and download the complete .dmg installer (from this folder https://download.qt.io/official_releases/qt/)
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install4j's multiplatform installer has been working great for years. Now out of the blue we are getting an error popup dialog that The installation file is corrupted. If it is a download please try again. It has installed about 19MB of 164MB and the last file it didn't write was a small jar that has been in the build for some time now.
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