Don't trust random "free download" sites. Use myWorld or your dealer. If you share which specific instrument or task you're trying to do (e.g., "import GS16 data" or "export DXF"), the community might suggest a better, safer, or free alternative.
Leica Survey Office 2.21 provides a minimalist, high-utility toolkit focused strictly on data management and instrument configuration. Data Exchange Manager leica survey office 2.21 english download
: Allows users to manage coordinate geometry and define feature codes for automated plan annotations. Don't trust random "free download" sites