unable to upload license file

After trouble with the installation ( the .NET settings all the rows in the application pool where set to V2.0 instead of v4.0). I having trouble uploading the license file. Clicking on "upload New License" at Administration->Licensing there is no reaction at all. Any suggestions?

Problem solved. On the server was a version of IE(11) installed who was cousing the trouble.
I installed the latest version of Firefox and problem was solved