It's a limitation of Windows Installer dialogs. Since it's controlled by Microsoft, there is not much we can do. You may want to consider using an InstallScript project to get workaround.
It appears that the product configuration and release name are specified conversely. It should be IsCmdBld.exe -p "c:\fk05uk\Komponente InstallShield\DMS17pro_Install\FlukeDMS17proNEW2016.ism" -a "Fluke DMS 1.7.00 professional" -r "Komplett"....
Have you configured InstallShield to use a more recent version of SQL Server client driver that supports TLS 1.2? See TLS 1.2 support for Microsoft SQL Server topic for more details about the updates of client components. Also,this blog post should h...