Follow these exact steps to avoid the dreaded "Installation Interrupted" or "Error 0x80070643."

Select the destination directory (default is usually C:\MELSOFT\MSSFT ). Once the progress bar finishes, click Finish .

If you downloaded the software as a .zip or .rar archive, extract the files completely to a local directory (e.g., C:\MELSERVO\ ). Running the installer directly from a compressed folder will cause the installation to fail midway. 3. Step-by-Step Installation Guide

Turn on the main 24VDC/200VAC control power supply to the servo drive. Screen resolution scaling issue. Change Windows display text scaling back to 100% (Normal).

| Issue | Likely Cause | Suggested Solution | | :--- | :--- | :--- | | | Incompatible OS, corrupted install, or missing admin rights | Run the installer and the main app as Administrator. If the issue persists, reinstall on a compatible older PC with a legacy OS like Windows XP. | | Cannot connect to servo ( Communication error ) | Hardware/software mismatch | 1. Double-check COM port and baud rate in software settings. 2. Physically check the RS-232 cable type and connections. 3. On the servo drive, verify the communication settings (e.g., station number and baud rate). | | New parameters don't take effect | Drive needs a power cycle | Some parameters (often marked with an * in the software's help or parameter list) require the servo amplifier to be completely powered down and then powered back up to be applied. | | WDREG.exe Error during installation | Known issue with legacy installer | This is normal. Simply click the "OK" button and let the installation finish. |