I can not reproduce the problem.
What is your Aternos username and can you post a sceenshot of your files?
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Zip files get unzipped automatically, and I tested it right now. It works.
Which version of the plugin did you try to install?
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On the spigotmc page of that plugin there are no dependencies listed.
Also the author wrote in the comments that this plugin has no dependencies
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Already denied
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Server pack outdated
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The mods in modpacks are optimized coordinated with each other.
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Your server is overloaded, remove mods.
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There are no dependencies named on their plugin page.
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Not a modpack
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URL broken
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Outdated server pack
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We can only add plugins from spigotmc.org or dev.bukkit.org
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We can only add mods from curse