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Does the file 'esptool.exe' in the subfolder 'bin' exist?

Hello,

there is a chance your antivirus program is too aggressive and removed the exe file below the folder 'bin', which should contain 'esptool.exe'.
Check this and if not found disable your...

Make also sure GHL Control Center is not connected to ProfiLux4. The comport must be exclusively accessible by the WiFi-Update-Tool.

If you click on the devicelist dropdown, there are most likely more COM-ports listed.
You must find out which one is connected to your ProfiLux4.

After selecting the right port and clicking...

Hello,

select COM7 and press identify device. This should show PL4 in the textbox.
Then press start, which opens the command prompt and starting the flash procedure.

Can you execute the file...