Microsoft .NET Framework 4.5 Offline Installer is available for Windows 7 SP1 (64-bit) through the Official Microsoft Download Center
Microsoft ended support for Windows 7 in January 2020. However, .NET Framework 4.5 will still install and function. If you are building a new setup, consider installing (the last version to support Windows 7), as it is backward compatible with 4.5. But for strict legacy compatibility, 4.5 remains a solid choice. Microsoft