Your teacher knows the textbook by heart. If you turn in homework citing page 147 of the 2014 PDF, and the current book has that content on page 198, you will be caught. Don't risk your grade for a free download.
You are not alone. The search for a digital copy of the Santillana "Historia" textbook for the fourth year of Compulsory Secondary Education (ESO) is one of the most common queries in Spanish educational forums. historia 4 eso santillana pdf
Instead, use the if you can afford it, or the free regional government textbooks if you cannot. Pair these with YouTube summaries, and you will not only pass your history exam—you will actually understand why the world looks the way it does today. Your teacher knows the textbook by heart