I have added  .exe to the file and have got it installed. Many thanks.

I encountered a couple of small problems during installation, described below, in case anybody else encounters the same.

• At the start of the installation, a dialog box appeared saying that the installer had encountered a problem, and giving me the option of sending a report, which if actioned, closed the installer. However, it can be moved to one side, the underlying installation dialog is still active and the installation can be completed.
• The installed program was the standard DS4 and required the serial number, sent separately by e-mail, to release the PRO plugins. It took me a bit of time to find that this could be done under the registration tab in the Help menu.

Mitch