Factorio: Space Age continues the player's journey after launching rockets into space. Discover new worlds with unique challenges, exploit their novel resources for advanced technological gains, and manage your fleet of interplanetary space platforms. For more information about what comes with the expansion, check out our Space Age content page.
You could just buy it direct from their site
Which is exactly what I am trying but the payment redirects to the humble store at the end and they always cancel the transaction with no helpful error message.
And since their “projected time to answer” currently is 7 days it’ll still be a short while until I get that sweet cracktorio hit again 😅