Thanks for getting in touch. The link that you have will download the latest fast lane release, not the latest LTS release. If you modify your link to https://octopus.com/downloads/slowlane/WindowsX64/OctopusServer you will receive the latest X64 LTS release for Octopus Server.
Let me know if there is anything else that I can assist with,
Hi Alex,
Thanks for getting back to me so quickly. I have updated our script to pull from the slow lane location. I initially following this document - Automating Octopus installation | Documentation and Support. Might be worth updating it to include the different latest download locations.