Did you Google it before you bought it?
Windows 10 demands software drivers written for it. Older drivers will be unstable or just fail.
I normally don’t pay any attention to reviews but these were interesting. One bad review had it back to Presonus multiple times and then just finally gave up. One of the good reviews praised Presonus’s return policy when they sent it back. One reviewer claimed it worked OK with Windows XP or before. Windows 3.1??
Having a multi-track interface arrive as stereo isn’t unusual. I suspect if you did it right, you should be able to get any two adjacent channels to do that. The desperation method for multi-channel if you can’t get it to work any other way is to mount it Stereo.
Audacity does support multi-channel recording, but it’s not easy.
https://forum.audacityteam.org/t/multi-channel-recording-in-audacity/15644/1
Some of these were written before Win10, so may not work right, either.
Bottom line, if you can’t find Windows 10 drivers for it, see if you can get your money back.
Koz