Do not use a pirated PDF. Purchase the genuine directly from the JCT website. It is reasonably priced (approx. £25–£40 for PDF download) and ensures you have a legally current, enforceable document.
How to obtain an official, legal copy
The FIDIC Green Book 2021: Efficiency, Risk, and the "Hot" Demand for Short Form Contracts short form of contract 2nd ed 2021 green book pdf hot
While the 1999 edition was restricted to small projects (often under USD 500,000), the is designed for a much broader range of works, including those exceeding USD 10 million and lasting over two years. Do not use a pirated PDF