This is the link to the Gearbox download. I have it installed on a Win 10 laptop and it still works for me. I see they state, "OS: Windows XP, Windows Vista, Windows 7, Windows 8" but it works for me on Win 10.
GearBox Gearbox Installer Version 3.72Released 3/16/10
Works with:
GuitarPort
POD Studio GX
POD Studio KB37
POD Studio UX1
POD Studio UX2
POD X3
POD X3 Live
POD X3 Pro
PODxt
PODxt Live
PODxt Pro
TonePort DI-Gold
TonePort DI-Silver
TonePort GX
TonePort KB37
TonePort UX1
TonePort UX2
TonePort UX8
This version of GearBox includes drivers which support Windows 7.
This single installer includes a complete software package for GuitarPort, TonePort, PODxt and POD X3 devices. It includes the GearBox application (v3.72), device drivers (v4.0.2.3) for all supported devices, the Line 6 Monkey intelligent updater (v1.33) and Control Panel (v3.41).
See the GearBox manuals page for step-by-step installation instructions and detailed setup info for use with many recording applications. Full release notes are available here.
For owners of eligible Line 6 hardware (other than TonePort DI Silver or Gold Plug-in Bundle or TonePort UX8) plug-in processing requires the purchase and activation of a license from the Line 6 Online Store.
OS: Windows XP, Windows Vista, Windows 7, Windows 8 ( 68.00 MB ) Get Download