Do not risk your project. A €250 PDF is cheap compared to a €500,000 dispute caused by a corrupted or outdated version of the contract.
The FIDIC Green Book is the best choice for international projects or where the Employer wants a familiar "traditional" engineer-supervised contract. NEC4 is better if you want collaborative project management. JCT is only suitable for UK domestic projects. fidic green book 2017 pdf
For now, the is the definitive short-form international contract. Do not risk your project
The 2017 edition of the Green Book introduced several significant changes aimed at improving clarity, fairness, and efficiency: fidic green book 2017 pdf