By now this is only for premium users, who receive an email with the link to download the new beta versions we release.
We released the beta version 2 some days ago, so if you are a premium user, you can wait until we release the beta version 3, or you can open a private ticket with your license and we will provide you the link to download it.
This is the link to open the private ticket: https://stockmanagementlabs.ticksy.com/
Take into account that this is a beta version, so it can contain bugs that can affect your site, so we recommend to test it with a staging site first.
Sprint 4 is beta version 4 🙂