Edit: I couldn't find the download zip option, Btw, the button is no longer green, it's been like that for months for me.😉
I just noticed pooya shared the link, but I don't know why it doesn't show the download option for me.
I just downloaded the ZIP file from Github.
Other than educational use, I have no other use of this tool.
If it is really useful for you to have this tool, I can try to upload it and set it on one of my domains.
edit:
https://btckeygen.com/ is online again