Plugin Berker push buttons

After installing the latest version of ETS (5.6.6) I encountered problems with a project including Berker push buttons (756627XX). I get a message that the import of the plugin failed and I am not able to open the plugin in ETS while I did not have any problems before my upgrade (from a perivious ETS5 version). If I import a new push button from the same type out of the catalogue the plugin works just fine but the upload of the configuration to the button will not start (keeps on trying without success).

Does anyone have a solution? I guess I need an older version of the plugin but I can ont find the right one.

Thanks in advance,

Herwig