What specific task are you trying to accomplish with the ISO file (e.g., creating a Windows installer opening a file burning a disc

Websites promising "free product keys" often bundle downloads with malicious software.

If you need to do more than just burn an ISO to a USB, macOS actually has built-in tools that can handle basic ISO management for free. For Extracting and Viewing ISOs: Disk Utility

It bypasses the 4GB file limit constraint inherent to FAT32 drives by automatically splitting the massive install.wim file found inside modern Windows ISOs.