You want to install the latest version of SQL Server and want to know whether it is supported.
As stated in the system requirements, all the Microsoft SQL Server versions beginning from 2008 are supported, including the latest version.
Once you install the new SQL Server, you can Move the LanGuard Database using Detach and Attach functions.
If you plan to upgrade the SQL server instead of installing a new one, an upgrade to SQL Server 2019 may fail due to FIPS mode at the OS level. In such cases, temporarily disable the "Use FIPS compliant algorithm for encryption, hashing, and signing" setting, then proceed with the upgrade. Once the upgrade is complete, FIPS should be enabled again.