I have the FW TI 1394 yada yada. I also tried the legacy driver, Presonus swears that Legacy driver is not needed. And yes, I have Presonus StudioLive listed under Audio devices.
This is what Presonus told me to do:
Disconnect the SL 24.4.2 mixer from your computer.
> Right click your Start menu and select "System".
> Click "Advanced System Setting" to the left.
> Click Environment Variables button.
> Click the New button for the top section on this window.
> For "Variable Name:" type this exactly.
devmgr_show_nonpresent_devices
> For "Variable Value:" enter a single number " 1 ".
> Click OK and couple times and then open the Device Manger.
> Click the View menu and check "Show Hidden Devices".
> Right click and Uninstall any "FireStudio", "PreSonus", and or "Unknown Device" you see listed under any category.
> Restart your computer. Then reinstall the driver
This is what I replied. Sorry I have no time to edit it- just copying the reply.
This is NOT IT. I checked for the hidden devices. I have under "Other devices" Generic Monitor and Marvel Console. I do not know what the Generic Monitor is, but I have 4 monitors connected to this computer, so can be anything. The Marvel console is Startech PCIe x4 SATA adapter to connect extra SATA drives. I don't have any extra drives connected there right now but I did test it in the past and was able to connect the hard drive to it, so it is working. I installed the Startech driver but it still shown under Other devices, but I doubt it related to Presonus issue (unless it interferes with FW card, but I am pretty sure- I tested the FW card without SATA controller at some point).
I reinstalled the Universal Control again after uninstalled it and deleted its folders and dump file. Without changing to Legacy FW driver, it does not open. It says the driver did not install correctly. BUT:
The instruction you provided on how to manually install the UC driver only applicable if the Presonus shows under "Other Devices" with (!) mark to it. This was the case with the old driver. With this driver, the Presonus is listed under the Audio Devices, where it should be listed, which means- the driver got installed correctly. If I right click on it any way and select to Update Driver, for the driver location, C:\Program Files\PreSonus\UniversalControl is already selected and when I click next, it says, "Windows determined that the best driver is already installed...". So not much I can do there.
I did not install Studio One, because... it is not a full version and I don't like to install stuff I will not be using- it creates registry conflicts. But I did attempt to set up Free Standing software synths such as Kontakt and Tone2 Saurus and I could not get any sound out of them. The Presonus was listed and selectable, but no sound.
My hardware Mixer is set to receive FireWire on 2nd track (26-26). I do not know how to set it to receive to track 1-2, this is why I can not confirm that there is no sound in Windows. I have 2 FireWire buttons on over the Sub2 and Sub4 and Main button is on. The Windows set to output to Presonus Speakers, but it would likely go to Ch 1-2- I once made it work on 1-2 with my old computer and then had hard time to reset it back to 25-26. But I don't have good feeling about any of this. I like to know what causing this issue. Even if it is my hardware issue- I would like to know what exactly causing it. Can you recommend exact model of FW card that proven to work with Windows 10 and Kaby lake processors and Original 24.4.2 mixers? The model I have is on the compatability list and it works on my old computer but who knows. Thank you.