Steam Activation ID if Already Owned?

[IaMbOb]

I have owned Blockland for quite a long time now, and I just recently came back to it and see that it's on Steam.  How do I unlock it on Steam with my old ID (7172)?
Or do I flat out have to buy it again?

[Ad Bot]

[Twerky]

https://blockland.us/steam-redeem.php

[IaMbOb]

Thanks so much!

...can't believe i didn't see that...