openHABian | openHAB
https://www.openhab.org/docs/installation/openhabian.html# Upgrading openHAB 2 to openHAB 3. For openHABian users running openHAB 2.X, openhabian-config offers to migrate the openHABian environment and install openHAB3 for you. Menu option 42 will do the upgrade. Be aware that it isn't the answer to the ultimate question (opens new window): there is ONLY an openHAB upgrade path, you cannot downgrade ...
Windows - openHAB
https://www.openhab.org/docs/installation/windows.htmlShutdown the openHAB instance by typing logout in the currently running console.. Update the newly created C:\openHAB\userdata\etc\openHAB-wrapper.conf to include all necessary parameters:. Copy all the config text from the below section and paste it in your openHAB-wrapper.conf, replacing all existing content.; Adapt the first entry (OPENHAB_HOME) to match …
Installation Overview - openHAB
https://www.openhab.org/docs/installationNote that openHAB 3 will run under Java 11, and you can use it with openHAB 2.X as well. But be aware that although developers are working hard to make this work, there might be problems with the oldest parts of openHAB 2.x, such as some of the v1 bindings, due to non-backward compatible changes in Java 11.