If you guys need any more data, let me know.

The 2.5b1 version seems to have disappeared from the download page? http://www.displaylink.com/downloads/mac_downloads.php

Where are you all getting 2,5 beta 1?

It was on main download site yesterday, and got pulled off today for some reason.

2.5 beta1
 

Had trouble when I upgraded to Yosemite last year, so I checked to make sure there was a driver for El Capitan. I downloaded 2.5 beta 1.
Unfortunately, it broke while still in Yosemite. I was hoping it would work in El Capitan. Not the case. It does look like the DisplayLink is currently working on the problem.

Hi everyone,

If you have downloaded beta 1 we advise to uninstall it and delete the installation image.
We have hit a difficult issue at a very inappropriate moment with El Capitan just released. We are working on this as fast as we can.

Regards,
Carlo

2.5 beta 1
 

Thank you for the update Carlo!

Any further progress on the 2.5 version?

Trying to get my display back
 

I decided I needed my display to work so I tried reverting back to Yosemite. That is a remarkably slow process. I was hoping that reverting would replace the proper driver. No such luck. Unfortunately, even with the current drivers it stil did not work.
My Mac does not seem to recognize that the Display adapter is attached. So, now a purchased a new adapter.
Any luck with the new driver for El Capitan?

I think you just had the same issue, which ourzoo had - the firmware upgrade messed up your hardware. I am using 2.5 beta 2 with the El Capitan for last few days and everything seems to work fine for me.