Hi,
I can confirm that the licensing system is outdated, and you need to be an expert developer and hacker to bypass/crack licenses, especially with software like cPanel where each update makes it more complicated. Therefore, installation documentation doesn't exist and isn't available.
I see that you're having trouble accessing the admin panel. To resolve this, simply install the files to your web hosting, then log in with an existing account or, if necessary, create a new account directly in the database.