When ReportPortal is not located on an Intranet web server, Internet Explorer can may display the following message at the top of the browser:
You can click on the message and choose "Download File" or prevent this message from ever appearing by adding your ReportPortal site to Local Intranet via Tools > Internet Options > Security tab.
Alternatively an administrator can enable "Second Click Export" feature by going to Admin > Settings > OLAP Report > Exporting > Second Click Export. When using this feature, the users will have the chance to download the exported file by clicking on the export toolbar button for the second time.