Download the latest build from the Official Sudachi Website or GitHub Mirror. Simply extract the new files over your existing installation folder to keep your settings, or export your saves first if you prefer a clean install.
If you are asking about the (used for Japanese text analysis): install updates sudachi
Note: Method B is rarely needed; use Method A. Download the latest build from the Official Sudachi
There are two ways to update the actual program, depending on how you installed it. depending on how you installed it.