Well I'm not exactly sure what to tell you, it installs almost automatically for me (Windows 10 user). I do have a few ideas though. Because it installs on its own (unlike most mods where you get to manually choose your install path), it could have something to do with your registry path for the game. I tried to install KOTOR Tool and ran into this annoyance. Or is the game installed on your system hard drive or in with your system folders (all that stuff is protected by your computer). I installed my Steam folder under My Documents. Otherwise you need to run every .EXE as Admin., and that only works sometimes.
Goodluck
I'm also not entirely sure of what your question is. If you are having trouble downloading it(depending on which country you are from), you may need to use a VPN.
But this file will not extract with 7z because it is a .EXE executable (on occasion I have been able to extract them, but not this one). You need to run this file.
Once again,
Goodluck
I'll add one more thing. If you custom name your install folder (like I do sometimes), don't put symbols in the name. Nothing ghosts a executable better than putting symbols in the name of the directory.