I've just updated the files.
Please, try again.
If you continue having issues I'll take a deeper look
Thank you in advance :)
I'm not sure if the desktop launcher can unzip both files together.
Try this: download both files — EchoesWindows Part 1 (you’ll get a file called EchoesWindows.zip) and EchoesWindows Part 2 (EchoesWindows.z01).
After that, extract EchoesWindows.zip. The second file will be used automatically during the process.
Have a nice day.