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Installation

Get PhasmoDecrypt up and running on your Windows machine in just a few steps.

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System Requirements

Before installing PhasmoDecrypt, ensure your system meets these requirements:

Operating System

Windows 10 or Windows 11 (64-bit)

.NET Runtime

.NET 9.0 Runtime or SDK

Memory

Minimum 100 MB free RAM

Storage

Minimum 50 MB free disk space
PhasmoDecrypt is a Windows-only application. It requires the .NET 9.0 runtime to be installed on your system.

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Step 1: Install .NET Runtime

PhasmoDecrypt is built with .NET 9.0. If you don’t already have it installed:
1

Download .NET 9.0

Visit the .NET download page and download the .NET Desktop Runtime 9.0 installer for Windows.
2

Run the installer

Double-click the downloaded installer and follow the on-screen instructions.
3

Verify installation

Open Command Prompt or PowerShell and run:
dotnet --version
You should see version 9.0.x or higher:
9.0.0

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Step 2: Download PhasmoDecrypt

1

Visit the releases page

Go to the PhasmoDecrypt releases page on GitHub.
2

Download the latest release

Under the latest release, download the PhasmoDecrypt.zip file.
Look for the release tagged as “Latest” with a green badge.
3

Extract the ZIP file

Right-click the downloaded ZIP file and select Extract All…Choose a destination folder, such as:
C:\Tools\PhasmoDecrypt
Avoid extracting to folders that require administrator permissions, such as C:\Program Files.

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Step 3: Verify Installation

After extraction, your PhasmoDecrypt folder should contain: 
PhasmoDecrypt/
├── PhasmoDecrypt.exe          # Main executable
├── PhasmoDecrypt.dll          # Application library
├── Newtonsoft.Json.dll        # JSON library dependency
├── PhasmoDecrypt.runtimeconfig.json
└── PhasmoDecrypt.deps.json
1

Navigate to the folder

Open File Explorer and navigate to where you extracted PhasmoDecrypt.
2

Run PhasmoDecrypt

Double-click PhasmoDecrypt.exe to launch the application.You should see the PhasmoDecrypt ASCII art logo and main menu:
         _____   __  __  ______  ____             _____       ____    ____    ______  ______   
        /\  _`\ /\ \/\ \/\  _  \/\  _`\   /'\_/`\/\  __`\    /\  _`\ /\  _`\ /\__  _\/\__  _\  
        \ \ \L\ \ \ \_\ \ \ \L\ \ \,\L\_\/\      \ \ \/\ \   \ \ \L\_\ \ \/\ \/_/\ \/\/_/\ \/  
         \ \ ,__/\ \  _  \ \  __ \/_\__ \\ \ \__\ \ \ \ \ \   \ \  _\L\ \ \ \ \ \ \ \   \ \ \  
          \ \ \/  \ \ \ \ \ \ \/\ \/\ \L\ \ \ \_/\ \ \ \_\ \   \ \ \L\ \ \ \_\ \ \_\ \__ \ \ \ 
           \ \_\   \ \_\ \_\ \_\ \_\ `\____\ \_\\ \_\ \_____\   \ \____/\ \____/ /\_____\ \ \_\
            \/_/    \/_/\/_/\/_/\/_/\/_____/\/_/ \/_/\/______/    \/___/  \/___/  \/_____/  \/_/

        Decrypt    Encrypt    Exit
3

Test navigation

Use the Left and Right arrow keys to navigate between menu options.Press Enter to select an option.
If the application launches successfully, you’re ready to use PhasmoDecrypt!

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Alternative: Build from Source

If you prefer to build PhasmoDecrypt from source:
1

Install .NET SDK

Download and install the .NET 9.0 SDK (not just the runtime).
2

Clone the repository

git clone https://github.com/Oztturk/PhasmoDecrypt.git
cd PhasmoDecrypt
3

Restore dependencies

dotnet restore
This will download Newtonsoft.Json (version 13.0.3).
4

Build the project

dotnet build --configuration Release
The compiled executable will be in:
bin/Release/net9.0/PhasmoDecrypt.exe
5

Run the application

dotnet run
Or navigate to the build output and run PhasmoDecrypt.exe directly.

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Project Structure

For developers interested in the codebase structure: 
PhasmoDecrypt/
├── Classes/
│   ├── Crypter.cs           # AES encryption/decryption logic
│   ├── EditJson.cs          # JSON modification presets
│   └── Globals.cs           # Constants (version, secret key)
├── Components/
│   └── UI.cs                # Console menu navigation
├── Program.cs               # Main entry point and menu logic
├── PhasmoDecrypt.csproj     # Project configuration
└── PhasmoDecrypt.sln        # Solution file

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Key Components

Located at Classes/Crypter.cs, this class implements:
  • Decrypt(byte[] data) - Decrypts save file bytes to JSON string
  • EncryptData(string data) - Encrypts JSON string to save file bytes
Uses AES-256 in CBC mode with PBKDF2 key derivation (100 iterations, SHA1).
Located at Classes/EditJson.cs, provides static methods:
  • UnlockAllTier3() - Unlocks all tier 2 and tier 3 items
  • MaxItems() - Sets all inventory items to 999
  • EditMoney(int amount) - Changes player money
  • InfinityXp(int amount) - Changes player XP
Located at Components/UI.cs, implements a reusable menu system with arrow key navigation and the PhasmoDecrypt ASCII banner.

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Troubleshooting

Install the .NET 9.0 Desktop Runtime from the official download page.
Move the PhasmoDecrypt folder to a location that doesn’t require administrator permissions, such as your Documents folder or a custom folder in C:\Tools.
PhasmoDecrypt should remain open. If it closes immediately, try running it from Command Prompt:
cd C:\Path\To\PhasmoDecrypt
.\PhasmoDecrypt.exe
This will show any error messages.
The Newtonsoft.Json library should be included in the release ZIP. If missing, download it manually or build from source using dotnet restore.

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Next Steps

Now that PhasmoDecrypt is installed, you’re ready to:

Quick Start Tutorial

Follow a step-by-step guide to decrypt your first save file

Learn the Basics

Understand how PhasmoDecrypt works under the hood

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