Windows 10 64 Bit |work| — Net Framework 3.5 Offline Installer

You likely downloaded an ARM or 32-bit CAB. Ensure your ISO is labeled x64 (not x86).

: You must have a USB or DVD containing the exact version of Windows 10 currently installed on your system. Net Framework 3.5 Offline Installer Windows 10 64 Bit

Even with an offline installer, errors can occur. Here is how to resolve them. You likely downloaded an ARM or 32-bit CAB