Fix Windows installer script

Installation Instructions:

1. Clone the repository: git clone [repo-url]
2. Download the core source code and place it in the project root
3. Ensure the folder structure:

/node/
├── installerWindows.ps1
├── genesis.json
└── core/ ← must contain source code
├── cmd/
├── build/
└── ...

4. Run the installer: .\installerWindows.ps1

Changes Made:

• ✅ Fixed syntax errors in PowerShell script
• ✅ Simplified installation process using local core folder
• ✅ Removed version dependency for better compatibility
• ✅ Added prerequisite checks for git, go, openssl
• ✅ Improved error handling and user feedback

Important Note:

For successful installation, users must:

1. Download the core source code folder
2. Place it in the same directory as the installer script
3. Ensure the folder is named exactly core

Benefits:

• 🚀 No internet connection required during installation
• 🔄 No version dependency issues (works with any core version)
• 👍 Simpler and more reliable for end users
• ⚡ Faster installation process (no downloading needed)
• 🛡️ Better error handling and user guidance

Before vs After:

• Before: Script downloaded sources from internet → often failed
• After: Uses local core folder → guaranteed to work if folder exists