To get the , follow these platform-specific instructions.

| Error Message | Likely Cause | Solution | | :--- | :--- | :--- | | | Old version not fully removed. | Use ADB (Android Debug Bridge) or a system app remover to delete orphaned data in /data/data/com.rcti.diag . | | "Download failed - Network error" | Corporate firewall blocking APK/EXE downloads. | Switch to a mobile hotspot or ask your IT admin to whitelist *.rcti-diagnostics.com . | | "The code execution cannot proceed because VCRUNTIME140.dll was not found." | Missing Visual C++ Redistributables (Windows). | Download and install "VC_redist.x64.exe" from Microsoft. | | "License invalid after update" | The update reset the hardware ID (HID). | Deactivate the license on the old app (if accessible) or email RCTI support with your Dongle serial. They issue a new key within 2 hours. | | "Bluetooth pairing fails" | Android 14's new Bluetooth permissions. | Go to App Info > Permissions > Nearby devices > Allow. Then forget the dongle and re-pair. |

Reading and resetting Diagnostic Trouble Codes (DTC) or "Check Engine" lights. Vehicle Customization: