on https://openmolecules.org/datawarrior/download.html, confirm «I have read and understood the disclaimer» below the eventually green rectangles. This then opens a new text below with links to archives to update DW. If you use Windows, your link address for the updates is https://openmolecules.org/datawarrior/dw550win.zip. Decompress the download (ca 30 MB) and use its content (DataWarrior.exe, jniinchi.jar, and mmtf.jar) to replace the files of same name in your already existing installation of DataWarrior. And you got the update, ready to restart DW again.