Hi, a
In the upgrade guide it has a table on how to go from one version to another. You first need to go to 6.4 before you can go to 2019.4.
Here is the upgrade guide https://documentation.solarwinds.com/archive/pdf/SEM/SEM-Upgrade-Guide.pdfhttps://documentation.solarwinds.com/archive/pdf/SEM/SEM-Upgrade-Guide.pdf
Hope that helps