Ideally download the fresh image and do a clean install. That is because we haven't packaged all the tweaks and changes that we've made.
However, as TurnKey is based on Debian (v14.x = Debian 8/Jessie; v15.x = Debian 9/Stretch), it is possible to do a Debian "in place" upgrade. If you do a google for "how to upgrade debian jessie to stretch" you should find plenty of into, although it's essentially just a case of changing the sources.list entries (from jessie to stretch) and running "apt-get update && apt-get dist-upgrade". If you have any data that's important, please make sure that you do a backup first (just in case). If doing a Debian upgrade of a bare metal server, an image (e.g. using something like Clonezilla) is a good option (as Debian upgrades can't really be rolled back).
Good luck and either way, please feel free to post back with any feedback or questions.
Ideally download and do a clean install
Ideally download the fresh image and do a clean install. That is because we haven't packaged all the tweaks and changes that we've made.
However, as TurnKey is based on Debian (v14.x = Debian 8/Jessie; v15.x = Debian 9/Stretch), it is possible to do a Debian "in place" upgrade. If you do a google for "how to upgrade debian jessie to stretch" you should find plenty of into, although it's essentially just a case of changing the sources.list entries (from jessie to stretch) and running "apt-get update && apt-get dist-upgrade". If you have any data that's important, please make sure that you do a backup first (just in case). If doing a Debian upgrade of a bare metal server, an image (e.g. using something like Clonezilla) is a good option (as Debian upgrades can't really be rolled back).
Good luck and either way, please feel free to post back with any feedback or questions.