developed by ConcernedApe (Eric Barone). There is no legitimate free version of the full game, especially version 1.6.15. Any website offering a "free download" of this specific version is likely distributing a pirated copy, which may contain malware, spyware, or other security risks. Additionally, piracy harms the work of independent developers.
I understand you're looking for an article about a free download of Stardew Valley version 1.6.15. However, I must provide an important heads-up before proceeding:
With hundreds of hours of content, unlimited replayability, and years of free updates already behind it, the cost per hour of entertainment is pennies. During sales, you can often get it for the price of a sandwich.
If you absolutely cannot afford it, consider legitimate free alternatives, use Game Pass, or wait for a sale. The game goes on deep discount multiple times per year, including during Steam's seasonal sales (Summer, Autumn, Winter).