On Jan 22nd, 2019 Apigee released a new version of Apigee Edge for Private cloud - Version 4.19.01.
Version 4.19.01 includes new features and bug fixes, see release notes for details:https://docs.apigee.com/release/notes/41901-edge-private-cloud-release-notes
You can read and download the documentation from the Apigee website:https://docs.apigee.com/private-cloud/v4.19.01/overview
The documentation describes how you can download and install the software; downloading the software requires credentials - your FTP credentials will also work and if you don't have, or don't remember, then contact Apigee support.
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