To use DevalVR into Director you must install the ActiveX plugin. Download the installer here http://www.devalvr.com/install
(IMPORTANT: use Internet Explorer browser to enter to previous link to download the correct installer, because the ActiveX is the plugin for Internet Explorer)
If DevalVR is installed in your system, you can insert a DevalVR window into your Director project. Select "Insert ActiveX" option and select "DevalVR object" in the ActiveX list. You can manage all parameters from Lingo too, for example "src" parameter to load any QTVR file.
Tell me if you have more questions.