Microsoft does not distribute updates via Bitly or raw text files. Official updates come from officecdn.microsoft.com via the Click-to-Run (C2R) installer or Windows Update.
The search query "bitly office 2016 txt upd" refers to a common method used to bypass official activation for . This method involves using a Bitly link to access a text (.txt) file containing a batch script, which is then used as an activator . How the Activation Script Works bitly office 2016 txt upd