While some online sources claim the tool is "safe" if downloaded from the "official" source, there is no truly official or legal website for this tool, as it is a piracy utility.

Are you trying to in the toolkit, or do you need a step-by-step guide on how to use these features for a specific Office version? Repair an Office application - Microsoft Support

For those working in the SharePoint Framework, the SPFx toolkit now includes integrated AI capabilities.