Pro100 is not maintained like Adobe or Autodesk. It is a . The developers assume the user speaks Russian or Polish. The English version is often a "translation wrapper" over the Russian core.
: Often has improved configuration tools in the "Tools" or "Configuration" menu, though this depends on the specific distribution. Pro100 Change Language
PRO100 uses specific library files to translate the interface. If your version supports multiple languages, they are stored in the root folder. Check for .lng files : Look for files like English.lng Russian.lng Polish.lng The "Rename" Trick Pro100 is not maintained like Adobe or Autodesk