The filename includes "All in One x86 x64 ARM." This tells us the ISO wasn't an official leak from Microsoft's public servers. Microsoft usually distributes specific builds for specific architectures separately (one ISO for x64, one for x32, etc.).
You can download the Windows 10 RS5 Build 17618 All-in-One x86 x64 ARM ISO from the official Microsoft website or from other reliable sources. However, be sure to verify the integrity of the ISO file to ensure that it's genuine and hasn't been tampered with. windows 10 rs5 build 17618 all in one x86 x64 arm iso