Hi
1. You can find the links for different systems in the first post
2. The terminal is the "DOS-Box" under Windows.
3. First download the .apk File from the MD_Helper and copy it in the same direktory you've unpacked the Debugging Tool. So it's easier to find it.
Now start the terminal...
First i didn't see the warning on the smartphone to allow the connection. But after that it work's fine and the MD Helper is now installed on my Pixel 8.