To ensure you are downloading a secure and authentic version, always use official government or verified open-source repositories:
Free Download EPANET 64-Bit: The Ultimate Guide to Modeling Water Distribution Systems
EPANET is a Windows-based application. While many modern users search specifically for a "64-bit version," the official release of EPANET (v2.2) is designed to run seamlessly on both 32-bit and 64-bit versions of Windows.
For advanced users and developers, the source code and latest updates are maintained here in collaboration with the Open Water Analytics (OWA) community. Available Files for Download