There is a known problem with the upgrade process when moving from Geneious Prime 2025 Beta version (2025.0.0) to later versions. During the upgrade, an error may occur while it is trying to uninstall Geneious Prime 2025.0.0. To get around the issue, uninstall Geneious Prime 2025.0.0 manually first, then install the new version using an installer from the Geneious website.
Please see this page for details on how to uninstall Geneious Prime manually, and contact our support team if the problem persists.