If you try to install a product which requires such an extension and the installation process fails, the only fallback is to restart in Recovery mode and try adding the extension manually, as described here. Kernel extensions (KEXTs) and their successors System Extensions in Catalina are required not just to be signed using special certificates provided for the purpose, but are also required to be notarized. This article looks at how you can try working around these problems, without running malware by mistake. With the introduction of notarization requirements in Mojave 10.14.5 and Catalina, you’re more likely than ever to encounter apps which you can’t open.
