1) maybe, maybe not.
2) the end and nether dimension is normally stored in the default world folder in world/DIM-1 or 2 .
Posts by Roman
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Make sure that you've installed the same version of the mod as on the server.
Also select the right profile in your minecraft launcher. -

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Due the complexity of minecraft modding this is currently not possible. Maybe we'll add this feature in future.
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Due to multiple reasons this is not possible at the moment.
If you miss a plugin in our browser feel free to request it here: Plugin/Mod/Modpack Anfrage -
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Which errormessage did you get?
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Due to multiple reasons this is currently not possible.
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You said, it freezes. Does really the server crash or your client?
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I don't know...
Maybe you can give us more information about the crash.