Try this: http://www.curse.com/bukkit-pl…/ultimate-skyblock/695116
It says that the version is 1.0.7 (for 1.5.1. Same as Aternos).
Posts by GoldenLion
The Aternos forums are now deprecated
Learn more about this change here.
For help regarding Aternos, we recommend you to visit our support center.
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Subject says all: am I allowed to have two servers (2 accounts)?
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If you are getting error "Invalid session" then it means your server is in online mode (Premium) and as you are not premium, you can't connect to your server.
To make your server run in offline mode (Cracked), you need to go to your server options and change "Online Mode" to "Cracked".