The Preface to the 1.7 Getting Started guide contains a link that points to the complete getting strated quickstart example on Github: https://github.com/quarkusio/quarkus-quickstarts/archive/1.7.6.Final.zip.

However, upon clicking the actual link in the document, the browser tries to reach the following domain resulting in a 404:
https://codeload.github.com/quarkusio/quarkus-quickstarts/zip/1.7.6.Final
As far as I remember this used to be the old domain for downloading Quarkus quickstarts

The link in the source has been verified as being correct (it points to https://github.com/quarkusio/quarkus-quickstarts/archive/1.7.6.Final.zip.).
in the source, the link uses the following macro:

link:https://github.com/quarkusio/quarkus-quickstarts/archive/{ProductLongVersion}.Final.zip

An identical macro is used in the 1.11 version of the Getting started guide, where the same redirect resolves to the correct address on Github.

Because this behavior seems to affect both Production and Stage on 1.7 only, the issue might be caused by Pantheon still trying to access a cached version of the target URL that we have used before we updated the guides. (The 1.11 titles have been created after we updated the URL.)
One of the things that might help is clearing the for the 1.7 splash page in Pantheon.