Thanks for getting in touch! I can think of a couple options that may help.
Firstly, if you have access to a fileshare in that location, you can copy files to that location from a script on the server-side. You can use either a PowerShell script step in your deployment process, or in a postdeploy script. Your postdeploy script can exist in your package, where Calamari will then detect these scripts and invoke them. Additionally, you can define a postdeploy script from within your package step using the Custom deployment scripts feature. You can refer to our documentation here for more info: https://octopus.com/docs/deploying-applications/custom-scripts#Cust...
Another option is offline package drops. These are deployment targets which were designed for situations where Tentacle isn't an option, perhaps because of a firewall. It works by bundling up the files that are needed for the deployment on your target server, and then you execute the batch file to actually execute the deployment. You can refer to some more information on offline package drops in our documentation: https://octopus.com/docs/deployment-targets/offline-package-drop
I hope these options help! Don't hesitate to reach out anytime if you have any further questions.