There was a download of TopoSys 8.0.0.2006 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program lies within Photo & Graphics Tools, more precisely 3D Design. The actual developer of the software is GEOTOP.
The common filenames for the program's installer are TopoSys.exe, TopoSys50.exe, TopoSys70.exe or TopoSys80.exe etc. We recommend checking the downloaded files with any free antivirus. This PC software is developed for Windows XP/Vista/7/8/10/11 environment, 32-bit version. The most popular versions of the software are 7.0, 5.0 and 4.4.
From the developer:
TopoSys - the geodesical network processing software has become, a very useful tool for surveyors, with enhanced functionality and popular calculation and adjustment methods, easy data management in MS-Access databases. Display attributes and symbols for points and measured distances or angle.
You may want to check out more software, such as AllyCAD, fragMOTION or TANK, which might be similar to TopoSys.