Don't want simultaneous downloads in queue.

[Chaoz]

I had 2 files in my queue earlier and they were both downloading at the same time. How do I make it so that only one file downloads at a time automatically. I want the order of downloads ordered by when I add the files.

[rollingeyeball]

You must have been mistaken. What you want is how it works

No need to do anything.

[Chaoz]

It downloads both files at the same time for me.

[inpheaux]

That isn't doing what you think it's doing.

You likely started one job, let it go for a bit, and then started the second job. The second job was posted more recently, so when the queue was sorted by age it started downloading. It then looks like both are downloading because they both have progress bars, but I promise you only the top one is downloading.

[Chaoz]

Does that mean it downloads the most recently added files first? I want it to download the old files first.

[shypike]

The most recent jobs go to the bottom of the queue.

There are some sorting options available.
See Config->Switches: "Sort by age".
Plus you can sort the queue at any time by clicking one of the Sort buttons.