When upgrading my Spectrum environment is it possible to only upgrade a single server without upgrading the entire environment?

Document ID : KB000077168
Last Modified Date : 12/04/2018
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Question:
When upgrading a multi-server Spectrum environment is it possible to only upgrade a single server without upgrading the entire environment?
Answer:
It is not possible to run a mixed version Spectrum environment as it is not supported any many unforeseen problems may arise when doing so.
In an upgrade scenario, at no time can an upgraded SpectroSERVER communicate with the previous version OneClick server.  If upgrading a SpectroSERVER you will need to also upgrade at least one OneClick server so they can communicate.