How to download a earlier version of CommCell enviroment?

I'm creating a lab with VMs set up exactly like the production environment.

In the productive environment, we have version 11.18.3 of CommCell.

This version has not been discontinued and is not available for download from the Commvault Store.

How do I find this version? The idea is just to replicate the current configuration exactly in order to be able to migrate from the old version to a new version with more property, since I will have already performed the migration in the lab environment.