[Mark Nord]

Downlaod from unprotected, non-login-sites is added by PRS+ (see 950_bootstrap.js)

Spoiler:

// Add option to download files
        kbook.webviewexData.onUnsupportedMimeType = function (url, mimetype) {
                try {
                        var dialog = kbook.model.getConfirmationDialog();
                        dialog.target = this;
                        dialog.onOk = function () {
                                PARAMS.Core.shell.exec("/usr/bin/wget -P /Data " + url);        
                        };
                        dialog.onNo = function () {
                        };
                        dialog.openDialog("fskin:/l/strings/STR_UI_BUTTON_DOWNLOAD_NOW".idToString() + "?\n\nURL: " + url + "\nMIME: " +mimetype, 0);
                } catch (ignore) {
                }
        };

But as the PRS-950 browser dosn't support cookies download from protected sites isn't possible.

Please direct further questions about this to the PRS+ main thread