The Developer's Devlog on Itch.io for the most recent version updates (v1.4.10).
The update was a game-changer for RPG Tycoon, moving it away from a simple gold-based economy to a more complex resource management system. Key Features of the Update RPG.Tycoon.Supply.and.Demand.v1.4.9.rar
You can no longer just stockpile gold. You now have to source, store, and trade resources like food and materials to keep your kingdom running. The Developer's Devlog on Itch
A new Trading Post allows you to sell surplus resources or buy what you're missing to survive. You now have to source, store, and trade
Recent patches (like v1.4.10 ) have focused on "Mega Stability," fixing long-standing issues like memory leaks and save-game bugs. Where to Find More
It looks like you're searching for info on (v1.4.x). While the specific .rar file name you mentioned often appears on file-sharing sites, the actual "good article" or content you're likely looking for is the massive overhaul this update brought to the game.