In late 2021 and throughout 2022, Microsoft began enforcing a stricter driver signing policy by default. Without getting too technical, Windows 11 now requires kernel-mode drivers to be digitally signed with a certificate issued by Microsoft.
The phrase "loopMIDI Windows 11 patched" typically refers to a modified or updated version of the popular virtual MIDI cable software, loopmidi windows 11 patched
Which (Ableton, FL Studio, etc.) are you trying to connect? In late 2021 and throughout 2022, Microsoft began
and other virtual MIDI ports due to Microsoft's rollout of a new MIDI 2.0 stack (notably in Preview Update KB5074105 In late 2021 and throughout 2022