Unfortunately Label Software SDK v8.7.4 doesn't support the new printer 5series. Hence you have to use the new SDK which is Dymo Connect SDK. I honestly can't find the solution to that one yet... there is no installer it is only a dll file. Once opened with a .net constructor I have no idea which constructor to use...
My solution is probably gonna be buying the old models (450) and use the code I have with the label software sdk.
