Thanks for replying!
I found this on Github: Copyright MIT Admin LTE · Issue #1077 · ColorlibHQ/AdminLTE · GitHub
" There is no need to keep the footer copyright. The MIT license explicitly states that only the source code copyright must be preserved. In this case, the CSS and JS files, which contain license headers, are the aforementioned source code files. Therefore, an attribution such as “designed by Almsaeed Studio” in the footer is appreciated but not required. I hope this clarifies the issue."
So it means, this answer on Github is only for people who bought the license. Without buying the license you’re not allowed to remove the footer, is this right?