I've got the problem showed in the first link.
I tried redownloading the game a bunch of times, I tried manually putting the .lzh file in the folder showed in the error but it gets deleted after I retry the setup, I even tried downloading the RTP but nothing.
Can you try uploading a pre-built version of the game? I know the feeling of people unable to play your game for technical reasons and I want to help you prevent it.