All mods off except the 3 DLC, this mod + the one it needs on. All other mods are off

start game sandbox mod or use /cheat via console for all research done. The factorio wiki shows said recepe. But there is not "unlock" research. And when placing a Foundry, there is no Landfill.

Also, do you know the concrete productivity mod? that one dosen't cause a conflict with your mod but it changes the recipy back to vanilla version. Well, then again, i guess that mod is not needed with your, just had it on since I was testing other mods until I got your.... Thank you for this amazing mod!! I never understood why the devs are so obsesed with, the more you advance, the more the game is a massive pain in the neck.

I'm happy to hear that you like my mod and thanks for the report. I noticed the error, too and it is already fixed for the next version. This and sand-casting recipe if needed, will be unlocked by the stone casting tech.
I don't know the concrete productivity mod yet, but I can do a compatibility patch later.

Version 0.7.2 is for the bugfix and version 0.7.3 has the productivity. If there is any issue just tell me