There is no official English edition of Roloff/Matek Maschinenelemente
In engineering, precision is paramount. When a file is "patched" (hex-edited or decompiled and recompiled), there is a risk that the code logic could be altered unintentionally. A mistranslated label is annoying; a corrupted variable in a calculation algorithm can lead to a structural failure in the real world.
Direct Purchase or Download
: If the book is available for purchase, consider buying it. Many books offer digital versions that can be more affordable.
Regarding a "patched" version, I assume you might be looking for a modified or updated version of the book. I couldn't find any information on a patched version of Roloff Matek Maschinenelemente. However, I can suggest some possible reasons why a patched version might be needed:
If you are looking for an English-language alternative that covers similar material (Mechanical Design of Machine Elements), the following resources are widely recommended by the engineering community: Standard English Textbooks Shigley's Mechanical Engineering Design
Summary Recommendation
Structural Basics
: Foundations of design, tolerances, fits, and surface finishes.