Downloading FileSieve
There is a free edition of FileSieve that is available for use; it is restricted in specific ways.
Please see the Edition Comparison page for a comparison between the different versions.
FileSieve is available as both an installer and a portable archive; the portable version will run within its containing directory and won't write to the system - this allows FileSieve to be used from, say, a memory stick, without leaving a "footprint" on the host system.
To use FileSieve 4, you will need to meet the following minimum requirements.
A 64-BIT Windows operating system that is either Windows 7 Service Pack 1, or Windows 8.1 or higher. This is an indirect FileSieve requirement; version 4.8 of the Microsoft .NET framework requires at least this version of the OS.
If you're using pre-Windows 7 SP1, you can instead use the previous FileSieve 3 release series.
FileSieve 4 has been built on the .NET framework, specifically version 4.8. Please note that the Full version of the framework is required, and not just the Client version that is shipped with some Windows-equipped PCs.