When you have received the license file, upload the file to any of the servers in your SharePoint Farm and start a SharePoint Management Shell.
Run the following WorkPoint Powershell command.
Set-WPLicense http://workpoint -FileName C:\temp\license.xml
-FileName <string> (Full patch to license file)
-Url <string> (The root Url of you WorkPoint solution, -Url can be omitted)