We have a install where there are 2 packages are deployed. ARC is used so the first package is always whatever was just pushed to octopus including prerelease packages, this is what we want. The second package will only ever use the most recent stable and will never pick the pre-release package that is already on the server and newer than the latest stable. Is there a way to specify in the Deploy package task that it can use pre-release packages if they exist?
Hi Leslie,
Thanks for getting in touch! Unfortunately you’ve hit upon a limitation with our ARC feature, where it can’t create a release for a package with a pre-release tag. ARC was really designed for older versions of TFS, where the build process wasn’t easily changeable, so it’s capabilities are limited.
If you’re currently using a build server, we’d strongly recommend creating your releases from there. We have extensions for a lot of the popular build servers which are available on our downloads page.
The benefit here is they use Octo.exe under the hood, which is a much more versatile approach that works well when using tags on your package versions (among other benefits). We have comprehensive documentation on integrating Octopus with build servers that you can reference here.
Let me know if this helps, how you go and if you have any further questions. 
Kind regards,
Kenny