Hey,

Super sorry for the delay in re-implementing this feature back into private mines,but I have re-implemented the mine upgrade feature back into the plugin it should work really good and also supports multiple blocks and such.

You also no longer need to have the default mine type name to "Default" my apologies for that mistake I had it for a debug thing at the start and forgot to remove it after all this time.

Thanks for being patient and waiting for this update,

Kyle