If you have a legitimate need to convert many legacy files, download the free 7-day trial of Adobe InDesign. InDesign can open PageMaker 6.0 files and convert them to the modern .INDD format. You can then cancel the trial.
Only get this if you’re a retro enthusiast, need to recover an old PageMaker file, or are running a vintage PC. For any real design work today, use Scribus (truly free, open-source) or Canva/InDesign (modern, safer). Free doesn’t always mean useful. adobe pagemaker 6.0 free download