The workaround is:
1. Go to Tools | Options or type the OPTIONS command
2. Click on the File Locations button
3. Select System | Help File
4. Click Browse...
5. Navigate to the .chm file of the language you wish to set for the help file, the path will start with (C:\Program Files (x86)\Corel\CorelCAD\Help\...) for 64-bit Windows and (C:\Program Files\Corel\CorelCAD\Help\...) for 32-bit Windows
6. Select the chm file and click on OK
7. The help files will now appear in the correct language