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If you use v2.4 not in a container, then you will have to start using the container. You don't need orchestration or a container practice in your organization, you can still use the same server you use now, just install docker and use the maturity level 0 advice to run Grouper. This should not be a barrier to running Grouper. If you are forbidden from running a container, at your institution and still want v2.5, it is possible to install docker, get the container, copy files out, and remove docker (sounds painful right? hope you don't have to do that 
).
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