If you are looking for specific versions to read without the hassle of multi-part archives:
Use 7-Zip (Windows) or Keka/The Unarchiver (macOS). Process: Ensure all parts are in the same directory . Right-click the file ending in .001 . Principia Mathematica.7z.001
Complete copies are available via the Internet Archive and Project Gutenberg . If you are looking for specific versions to
A file ending in .001 is part of a "split" 7-Zip archive. You cannot open it in isolation; you must have all sequential parts (e.g., .001 , .002 , etc.) in the same folder to reconstruct the original data. Principia Mathematica.7z.001
The original Latin text or the English translation (often by Andrew Motte) regarding the laws of motion and universal gravitation.