2018.1.4 version. Invoke code error when using UiPath.Excel.WorkbookApplication



I have recently installed new version of UiPath 2018.1.4 from https://www.uipath.com/freetrial-or-community after installing all the packeges and updates, I have tried to use invoke code to save excel workbook with a password. Unfortunatelly it seems that the workbookapplication is not found (after running the Studio, IntelliSense does not find this method). I also tried with importing namespaces (UiPath.Excel, UiPath.Excel.Activities) but they were already there.
Please find informative screenshot attached

Please help, since in 2017 version It worked properly.