This is version 11 of Blockland Classic Mod. See the full description if you own a copy of version 10.
Got a copy of version 10?
Do you own a copy of the old version 10 or earlier? You'll need to remove the older version as there will be a old files left that become corrupted after installing version 10. Delete the CLIENT and SERVER folder, then install version 11.
VERSION 11 PATCH [7/31/2017]
VERSION 11 CHANGES