Hellshade it works fine here with Windows 11 Pro.
Maybe you need to set the trackir.exe to run as an administrator - from properties, compatibility tab.
I do not have to do that here btw.
From that thread that VonS linked too, a user Jackal posted this:
"Here is the news: I managed to solve all my issues with TrackIR.
Thanks to the careful, patient assistance given by e-mail to a NaturalPoint technician in these last days, I had to wipe out literally any entries, one by one, of TIR in my PC/system, reinstall all the stuff from scratch, et voilà… the utility is back.
And it’s confirmed: the latest software/drivers released by NaturalPoint (5.4.2) is good in Windows 11 Pro too.
Hope no one can make my experience, but in that unfortunate case I am giving below the procedure that helped me to get out from almost a nightmare:
"1. Unplug the TrackIR from your computer.
2. Remove TrackIR from add/remove programs.
3. Remove NaturalPoint Drivers from add/remove programs (this is the device driver).
4. Delete NaturalPoint folder from Program Files x86.
5. Delete NaturalPoint folder from %APPDATA% location (APPData is a hidden folder). If you have tracking profiles you wish to keep, please back up this folder instead.
Open regedit.exe as an administrator. Please be careful not to change other items than the ones listed below.
Search for and rename labeled as “NaturalPoint” to “NaturalPoint-00”. The default location for this is Computer\HKEY_CURRENT_USER\Software\NaturalPoint
IMPORTANT: I DELETED ALL OF THEM INSTEAD.
The choice is yours here.
(If there are any other old references to NaturalPoint or TrackIR from the older version of the TrackIR within the registry, you may want to rename those as well.)
Reboot your PC/system.
Download the latest installer from NaturalPoint website.
-The latest download will also have their latest USB Drivers.
Right-click and install as an administrator. At the beginning, you will be prompted to install the device driver. Make sure this gets installed. It is important that you get prompted for this.
Locate the Track IR 5 Icon on your desktop, right-click on it and select ‘Run as Administrator’. (This only needs to be done the first time.)"
We are taking a break now for Christmas so I may not be around as much in here.