The Octopus Plugin currently depends on a 3 year old, deprecated Octopus CLI version. The commands that are used in the plugin use options that have changed. For example:

Current CLI create release command

octopus release create ...

Deprecated CLI create release command (which the plugin wraps and uses)

octo create-release ...

In order to test. I had to install the old CLI version. This was not ideal given that it is no longer supported.

Current Octopus CLI Commands:

https://octopus.com/docs/octopus-rest-api/cli

Deprecated Version Commands:

https://octopus.com/docs/octopus-rest-api/octopus-cli