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You will be able to use it forever. After 6 days only the EE features will be blocked (things like ACL, binary backups and so on). All the community features will work fine. It won’t break anything on your side.
I don’t get the question. ACL is EE feature, you have 30 days to test it. After that the feature won’t be available. There’s no ACL similar in the Open Source version.