Roland, who make the venerable MIDI to USB interface the UM-1, and its more recent version the UM-1X, claim that they will not support Windows 10. And, indeed, when you install Windows 10 onto a machine with the UM-1X plugged in, it remains unrecognised by the new operating system.

You can fix this with a text editor. Remember also you must set your Windows installation NOT to enforce driver signing. Please see the comments (below) for how to do this.

1. Download from Roland the driver archive for Windows 8.1. Its filename is um1_w81d_v101.zip.
2. Unpack the archive.
3. If you have a 64-bit machine, browse within the archive to this folder:
   um1_w81d_v101\Files\64bit\Files

4. Open the file RDIF1009.INF in your favourite text editor.
5. Edit line 33, changing:
   %MfgName%=Roland,NTamd64.6.2,NTamd64.7…to
   %MfgName%=Roland,NTamd64.10.0,NTamd64.7
6. Edit line 42, changing:
   [Roland.NTamd64.6.2] …to
   [Roland.NTamd64.10.0]

7. Save this file and exit the editor.
   One successful user reported that he plugged-in the UM-1 at this point.
8. Browse to your Device Manager by holding down the ‘Windows’ key, pressing ‘R’, then selecting “Device Manager” from the menu that appears.
9. Double-click on your non-functioning UM-1, which will be labelled “Unknown device”.
10. Select the second tab: “Driver”
11. Click the “Update driver…” button
12. Click “Browse my computer for driver software”
13. Browse to the folder containing the file you have just edited
14. Click ‘OK’ to select the directory, then click ‘Next’
15. When Windows complains “Windows can’t verify the publisher of this driver software”, click “Install this driver software anyway”
16. Wait until you see “Windows has successfully updated your driver software.

Done! You’ve installed the Windows 8.1 driver for the Roland/Edirol UM-1X on Windows 10, even though Roland state they don’t support this device. I can confirm that the MIDI input works just fine.