Click the download button. The file size should be between 1.5 MB and 4 MB for the core EXE, while the full suite (including upd definitions) is around 12-18 MB. If the file is smaller than 700KB or larger than 50MB, it is likely malicious.
The "upd" keyword implies a need to update either the tool itself or the firmware within a vehicle using the tool. ifast22exe download portable upd