If you have located a legitimate backup of (from a trusted private tracker or archive), follow this guide:
Before diving into FIFA 15, one must understand the source. is a renowned Russian-based repacking group that rose to prominence during the golden age of scene releases (2010–2018). Unlike traditional 0-day groups that release raw, uncompressed game dumps, R.G. Mechanics specialized in lossless repacking . FIFA 15.First.Edition.Repack-R.G.Mechanics
The repack typically features an automated installer that handles the crack and registry settings, making it "plug-and-play" once the installation finishes. Multilingual Support: FIFA 15 First Edition Repack-R