When trying to export a mail merge, it requires Slate Desktop app to be downloaded.
1. Select mail merge as the format you wish to export as
2. Pop-up will give you a prompt saying "If the program did not open immediately, download here", follow the "download here" link
3. Run the program once downloaded
4. MUST ENTER ADMIN LOGIN FOR INSTALL
5. Once the program is installed, re-export the mail merge file