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Use the toolbox to drag and drop elements. Assign Variables/Registers to each element (e.g., D0 for a Mitsubishi PLC or 40001 for Modbus).

| Feature | v5.2 (Legacy) | v5.3 (Current) | | :--- | :--- | :--- | | | Standard | Up to 20% Faster (Parallel compilation enabled by default) | | Library Manager | Manual Install | One-Click Cloud Sync | | Debugger | Basic Serial Print | Integrated GDB Debugging Support | | UI Theme | Light Mode Only | Dark Mode & High Contrast Options |

Map your HMI components to the PLC registers (e.g., mapping a button to M0.0 ). Why Upgrade to v5.3?

Proxy rotates but all requests fail Solution: Go to Proxy Manager > Test All. YKBuilder v5.3 marks dead proxies and can auto-remove them. Ensure your proxies support CONNECT method.