I saw that one of you collegues, Jesper Malmborg, has a few active Sitefinity licenses in his account. He also has access to a license for the requested version 6.0.4100.0. You can ask him to download this license file and give it to you. It doesn't matter that it's already registered for a different domain name, you can still use is as a demo license for running a project on localhost.
Hope that helps.
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