I decided to make a last-minute change to Version 3.1.5.
After extensive testing with different MIDI drivers and Windows configurations, it became clear that there are still too many compatibility issues with the new Windows MIDI Services to include it as part of the default installation.
My original plan was to build this release around the new Windows MIDI Services. However, the development tools are still in the Release Candidate stage (1.0.17-rc.4.25), and there are still ongoing fixes and unresolved issues with the new MIDI stack. At the time of writing, Windows MIDI Services is officially supported only on Windows 11, not Windows 10.
Because of this, I am currently updating the documentation and preparing a revised 3.1.5 build, which will be released within the next 24 hours. The new installer will not include Windows MIDI Services by default.
Users who already have Windows MIDI Services available through Windows Update can enable support for it as an optional feature from the Settings panel. However, doing so is entirely at the user's own discretion. I cannot guarantee that it will work correctly even on supported Windows 11 systems. Based on my testing, its behavior is highly dependent on each user's hardware, drivers, installed software, and Windows configuration. Some users may experience no issues at all, while others may encounter significant problems or it may not function correctly in their environment.
I believe this is the safest approach until the new MIDI stack reaches a stable production release. I'll continue testing future releases and will consider making it the default option once the platform has matured.