Unity 400 license problem

Hello.

I am posting because I have a question.

I have Unity 400 equipment, which I bought in 2020. I have a license as .lic, but I have updated it to 5.3 version and the license has changed to .xml.

You need to activate reinitialize to insert a new license, but the license does not work because the file format is different.

Is there any other way to change the .lic license to .xml or else work it out?

Thank you.