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You can receive the 100MB update on your device OTA (over-the-air) and its best downloaded while connected to Wi-Fi in order to avoid data charges. Also make sure that your device battery is fully charged before you initiate the update. Keep in mind that the updates generally roll out in phases and it maybe a day or so before you receive the notification on your device.
The Droid DNA is the current flagship Android smartphone from HTC, featuring a 5 inch full HD touch display, an 8 megapixel camera capable of 1080p HD video capture and is powered by a 1.5GHz quad-core processor with 2GB of RAM. It remains the company’s top smartphone until HTC unveils their HTC One smartphone which is set to take over as 2013’s new flagship.
source – Droid Life