T-Mobile is seeding January security patch to HTC 10. The Android 7.0 Nougat based January patch bumps the software version to 2.41.531.3, the device already received Nougat update by the start of January 2017. Now T-Mobile HTC 10 is receiving the security patch with some system enhancements in the firmware. Although the security patch is not the latest one but still it’s better to update your device on any latest available firmware.
The Nougat 2.41.531.3 firmware for T-Mobile HTC 10 is rolling out via OTA (Over The Air) and weighs about 650MB. Keep your device well charged to download and install the update on your device, if the update notification doesn’t hit your device yet then go to Settings > About device > System updates. You can also update your T-Mobile HTC 10 on previous Nougat update and then try getting the OTA by the same method again.