ZEN PDF Ultimate Edition

ZEN PDF Ultimate Edition is a Windows desktop tool for splitting and merging PDF files.
This software operates entirely offline and works only within the local environment.


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[Key Features]
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- Portable Design: Can be carried and used directly from a USB drive.
- No Installation: Simply extract and run.
- Self-Contained: A "zenpdf_data" folder is created in the same location to store settings.
- Clean Uninstall: Just delete the folder (or the exe file) to remove the software completely.


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[IMPORTANT] Please Read Before Use
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The downloaded file (folder with a zipper icon) will not work correctly if opened directly.

You must "extract" the contents before using the software.
Please follow these steps:

1. Right-click the downloaded file.
2. Select "Extract All..." from the menu.
3. Click the "Extract" button in the window that appears.
4. A new folder will open automatically.
   Please move the folder inside to your Desktop or USB drive.
5. Open the moved folder and run the application (.exe file).

* If you run the application while it is still inside the compressed folder (zipper folder),
  or if you move only the .exe file, it will not function correctly.


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[IMPORTANT] If a Warning Appears at Startup
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On the first launch, Windows Defender SmartScreen may display a blue screen stating:
"Windows protected your PC".

This is a standard Windows specification for unsigned applications.

Please follow these steps to proceed:

1. Click "More info" on the screen.
2. Click the "Run anyway" button that appears at the bottom right.

* This software does not contain any viruses or malicious programs.
  Please use it with confidence.


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About the License
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Since this software is designed not to communicate externally,
license information is stored only on your PC.

Only the "registered status" is saved locally.
Personal information, PDF file contents, or the license key itself
are never sent externally.


[Re-entering the License Key]

You may need to re-enter your license key in the following cases:

- Changing your PC
- Reinstalling Windows
- Changing your user profile
- Deleting the license information file (including the "zenpdf_data" folder)

This is by design and not a defect.

You can use the same license key as many times as needed,
so please enter it again if required.


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Uninstall Method
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This software does not require installation.
To uninstall, simply delete the folder (or the .exe file).
Please also delete the "zenpdf_data" folder if it exists.

The registry is not used.


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Support / Contact
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For bug reports or feature requests, please contact us via email:

■ Email
[ studio.nomad.worker@gmail.com ]

[Note]
As this software is developed by an individual, responses may be delayed.
We cannot guarantee a reply to every inquiry, but we read all feedback 
to improve the software.

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Notes
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- This software is Donationware.
  (All functions can be used without purchasing).

- Due to its portable nature, please do not place this software in folders
  requiring write permissions (e.g., Program Files).
  We recommend using it on your Desktop or Documents folder.


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Disclaimer
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This software is a tool for splitting and merging PDFs in a local environment.

We make no warranty regarding suitability for a particular purpose, completeness, safety, accuracy, or results.

The developer shall not be held responsible for any direct or indirect damages, data loss, or impact on business resulting from the use or inability to use this software.

Please use this software at your own discretion and risk.


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Update History
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2026/01/20  v1.0.1  Fixed write errors on USB drives / Improved portable mode behavior
2026/01/11  v1.0.0  Released


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Copyright © 2026 Nomad Worker Studio