The last step of the install installs microsoft server speech recognition language runtimes, it might be a problem with that. Uninstall OTT and the runtimes, reboot, try again, if no go uninstall OTT and the runtimes again, reboot and download the US microsoft server speech recognition language runtime file and install that first, reboot and then try installing OTT.
https://www.microsoft.com/en-au/download/details.aspx?id=27224