I kind of just skimmed the thread.
Maybe you could just do it the manual way?
Open the Colorset_XYZ.zip and take out the colorSet.txt
Go to your Blockland game folder.
Above posts show path
If you are on a mac on steam go to
/Users/*UserName/Library/Application Support/Steam/steamapps/common/Blockland
go to config/server and put in the colorSet.txt to replace it.