I have the same problem. If I ignore the error, it does not come back (until I restart Ansys). But the fields for "Source Design" and "Source Solution" remain empty. If I select something else in the "Setup Link" menu I also get the error message " Cannot access ElectronicsDesktop. Please make sure the product is installed". I followed the tutorial and also tried other simulations myself. However, the error appears every time when assigning EM-Loss.