Intel recommends that you obtain software and drivers from your OEM or system manufacturer, as they should have the very latest download for your exact system. Intel posts non-OEM specific, generic software and drivers only after we have already provided it to the OEMs.
To respond to your concern, the Intel Driver Update Utility is only updated twice a month, so there will be times that the "very latest software" is not available via this tool. Also, please know that we intentionally pulled the 17.1.1406.01 version from the Intel Driver Update Utility and replaced it with the older 17.0.1405.02 version due to the many reports of install / update issues with the 1406 version of software and drivers. We are currently troubleshooting an installer issue with the 1406 software package we had posted, so it's best for now to either use the 17.0.1405.02 or an older version that works, or better yet, check with your OEM to see if they have newer Bluetooth* software and drivers to provide to you. A newer version has been shared with OEMs.