[Download World "nether" and "end" with space in the name]

Hello. I know the server have some huge problems with the download of world. I need that to make backup and to make some tests in creative.

But as I try many times the "/dl World" I get almost every atempts the famous error "Failed to Load File"... but... but... with some magic sometimes I can get the link and save my world.

This is fine but just gets the overworld, the normal one. I miss the Nether and The End. When I type "/World" I get a list with the name of all the others. But my problem is that I have a space in the name of the world and it looks like "My Word_nether" 
I can't get a way to download this world as it says always "World Not Found". But even when I do "/dl World world_nether" (world_nether is in the list) it gaves the same error.

Anyone was able to download nether or end for a world with a space in the name?

 

Note: I tryed to rename the word and wll was reconstructed with a new world and a new seed, generating new directories... now have some more garbage in worlds list...

[Downloading worlds]

I have the same problems and it seems impossible to dowload nether or end world