However, by searching for a shady free download. Instead:
Sokpop Collective has released early prototypes of Stacklands on during game jams. While these are not the full v1.4.1.21, they are free and give you 80% of the core mechanic (typically up to the first 4 months). Search for "Stacklands Prototype" on Itch.io. Stacklands Free Download -v1.4.1.21-
This version is lightweight, stable, and contains the complete "vanilla" experience just before the DLCs complicated things. However, by searching for a shady free download