Can I buy additional keys for Adobe Premiere Elements 2018?

Hello again. I really want to use Adobe Premiere Elements 2018 again, but my key no longer works as I have used them all and don't have access to the computers to deactivate them. So my question is this - can I buy additional keys for Adobe Premiere Elements 2018? I have the new version, but it is missing quite a lot of features from the 2018 version.