.NET 4.8 may need to be manually installed if your systems don't have internet access.
Note
All Connexion libraries now target .NET 4.8. If you are referencing any Connexion assemblies, you will need to target .NET 4.8 in your projects. Please note that all non-core libraries are internal and subject to change.
.NET 4.8 must be deployed to remote agent host machines prior to deploying this release (assuming they are not already running 4.8)