Here's a tip for when you click on links from a multihoster, e.g. mirrorcreator, embedupload, uploadmirrors, etc.
JD will "decrypt" the multihoster links into individual links at every host for each file, so you may end up with a long list of links. I used to delete all but one link for each file, alternating between different hosts for each part. But I figured out a better way.
The problem was, sometimes a file would fail to download completely, and then I'd have to go back and find the link for that file at the multihoster again and choose a different host.
Instead of deleting, I now just disable the other links, by right clicking on all but one link for each file and selecting "disable" from the list.
Here is an example:
The light gray lines are links that I already disabled. The dark gray lines are links I selected just before right clicking, and now my cursor (which you can't see in this screen capture) is on "Disable (9)", which will disable the 9 links in dark gray. My next step would be to disable all but one of the remaining links to part 4, so that I have one active link for each part, all at different filehosts.
Then, after loading the "package", if any of the files fail to download, or download too slowly, I can simply disable the active link and enable one of the others (right click on the grayed-out link and select "enable").
You might find other good uses for disabling and re-enabling links, too.