On their page, SAi Flexi aka ThinkSai recommends Windows 10 to be installed on the computers where you want to deploy your product. Also, if you have an older version of Vinyl Express LXi2, then it might not be compatible with the Windows 10 operating system.
Since Vinyl Express LXi2 doesn't appear to be an available application on their official website, I recommend contacting the developers of the software. They will either provide an alternative or a way to continue using your vinyl cutter on Windows 10.
Access the following page to get in touch with the developers.