# Metaserver went live on an old RC4 version of Windows MIDI Services that is no longer available **URL:** \ **Category:** Support & Troubleshooting\ **Created:** [November 8, 2026, 9:19pm UTC](https://forum.metagrid.app/t/metaserver-went-live-on-an-old-rc4-version-of-windows-midi-services-that-is-no-longer-available/1680 "2026-11-08T21:19:40Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Psychlist1972](https://yyz1.discourse-cdn.com/flex009/user_avatar/forum.metagrid.app/psychlist1972/32/1248_2.png) [@Psychlist1972](https://forum.metagrid.app/u/Psychlist1972)\ **Post date:** [November 8, 2026, 9:19pm UTC](https://forum.metagrid.app/t/metaserver-went-live-on-an-old-rc4-version-of-windows-midi-services-that-is-no-longer-available/1680/1 "2026-11-08T21:19:40Z")
Just a reminder about what I posted back in June: The old release candidate from earlier this year did not have a go-live license, and the API fundamentally changed in preparation for going in-box for Windows 11 25h2 and later. Discussed extensively on our Discord server and in the [GitHub - microsoft/MIDI: Windows MIDI Services · GitHub](https://aka.ms/midirepo) release notes. Customers need to have rc4 uninstalled from their PCs, and doing so causes this app to no longer see Windows MIDI Services. If this product is still using the Microsoft.Windows.Devices.Midi2 SDK/API it needs to be updated to Windows.Devices.Midi2 and follow the instructions in the releases at [Releases · microsoft/MIDI · GitHub](https://aka.ms/midireleases) . I recent customer on my Discord server had some issues they ran into and I had to have them uninstall the old supported rc4 bits. It’s only then that I found out that metagrid is still using those. Pete Microsoft ---
**Author:** ![MetaGrid\_Admin](https://yyz1.discourse-cdn.com/flex009/user_avatar/forum.metagrid.app/metagrid_admin/32/21_2.png) [@MetaGrid\_Admin](https://forum.metagrid.app/u/MetaGrid_Admin)\ **Post date:** [November 9, 2026, 8:24am UTC](https://forum.metagrid.app/t/metaserver-went-live-on-an-old-rc4-version-of-windows-midi-services-that-is-no-longer-available/1680/2 "2026-11-09T08:24:45Z")
Hi Pete, Thanks for following up and for helping the customer who ran into this. You flagged the upcoming API change back in June, and we should have followed up sooner. We confirmed that MetaServer for Windows 6.0.5 shipped with the RC4 SDK. Its native MIDI detection checks for the RC4 runtime first, which explains why removing it can leave MetaServer unable to see native MIDI ports. We’ve retired the [old setup guide](https://forum.metagrid.app/t/1456/1) and removed the RC4 installation steps. The MetaServer for Windows 6.0.6 hotfix will be ready this week. It will move native MIDI support to `Windows.Devices.Midi2`. I’ll post the download link here when it’s available. Przemek ---
**Author:** ![tripleBrett](https://yyz1.discourse-cdn.com/flex009/user_avatar/forum.metagrid.app/triplebrett/32/90_2.png) [@tripleBrett](https://forum.metagrid.app/u/tripleBrett)\ **Post date:** [November 9, 2026, 1:45pm UTC](https://forum.metagrid.app/t/metaserver-went-live-on-an-old-rc4-version-of-windows-midi-services-that-is-no-longer-available/1680/3 "2026-11-09T13:45:52Z")
@przemek I am the customer! I sent you a message and an email, but I gather this is the answer. I will have to wait until the fix comes out to be able to use Metagrid. Is this correct? TY ---
**Author:** ![MetaGrid\_Admin](https://yyz1.discourse-cdn.com/flex009/user_avatar/forum.metagrid.app/metagrid_admin/32/21_2.png) [@MetaGrid\_Admin](https://forum.metagrid.app/u/MetaGrid_Admin)\ **Post date:** [November 9, 2026, 4:00pm UTC](https://forum.metagrid.app/t/metaserver-went-live-on-an-old-rc4-version-of-windows-midi-services-that-is-no-longer-available/1680/4 "2026-11-09T16:00:40Z")
Hi Brett, you can try the fix now. [Download MetaServer for Windows 6.0.6 Beta 2 (build 6021)](https://metagrid.app/downloads/beta/metaserver/windows/6.0.6/Beta2/MetaServer-6.0.6-Beta2-Windows.exe) and keep your current MetaGrid Pro app. Thanks, Pete, for helping us track this down. On Windows 11 25H2 or later, this build uses the newer Windows MIDI Services API, so you can leave RC4 uninstalled. After starting the beta, could you check whether your native ports appear on MetaServer’s MIDI page and whether a control on your iPad reaches your DAW? The beta installer is unsigned. The checksum and release notes are in [the pinned beta post](https://forum.metagrid.app/t/150/1). ---
**Author:** ![tripleBrett](https://yyz1.discourse-cdn.com/flex009/user_avatar/forum.metagrid.app/triplebrett/32/90_2.png) [@tripleBrett](https://forum.metagrid.app/u/tripleBrett)\ **Post date:** [November 9, 2026, 4:17pm UTC](https://forum.metagrid.app/t/metaserver-went-live-on-an-old-rc4-version-of-windows-midi-services-that-is-no-longer-available/1680/5 "2026-11-09T16:17:54Z")
This works. Thank you 🙂 ---
**Author:** ![Psychlist1972](https://yyz1.discourse-cdn.com/flex009/user_avatar/forum.metagrid.app/psychlist1972/32/1248_2.png) [@Psychlist1972](https://forum.metagrid.app/u/Psychlist1972)\ **Post date:** [November 9, 2026, 5:07pm UTC](https://forum.metagrid.app/t/metaserver-went-live-on-an-old-rc4-version-of-windows-midi-services-that-is-no-longer-available/1680/6 "2026-11-09T17:07:37Z")
Thanks for the quick response! For reference - Customers should uninstall, via Windows Settings \> Apps \> Installed apps, rc4 Tools, API, SDK, Transports, etc. - Current releases of tools and transports are at [Releases · microsoft/MIDI · GitHub](https://aka.ms/midireleases) but are not required for using Metaserver/Metagrid For the team here: The latest supported API is available in Preview 11 in the releases above. Tools and transports have moved on since then for customers, including quite a few new tools, but the API DLL to ship with your app is the Preview 11 version. Please also read the important preview 11 release notes as they have instructions for what happens when this DLL is shipped as part of Windows in System32 in the first half of 2027. Do not use the version of the DLL shipping with the Tools package. That ABI is not yet locked. If anyone runs into any MIDI-specific issues, please start a thread on the Discord Server [Windows MIDI / Audio](https://aka.ms/mididiscord) Pete Microsoft ---
**Author:** ![tripleBrett](https://yyz1.discourse-cdn.com/flex009/user_avatar/forum.metagrid.app/triplebrett/32/90_2.png) [@tripleBrett](https://forum.metagrid.app/u/tripleBrett)\ **Post date:** [November 9, 2026, 7:17pm UTC](https://forum.metagrid.app/t/metaserver-went-live-on-an-old-rc4-version-of-windows-midi-services-that-is-no-longer-available/1680/7 "2026-11-09T19:17:47Z")
@Psychlist1972 Thank you Pete!! ---
**Author:** ![MetaGrid\_Admin](https://yyz1.discourse-cdn.com/flex009/user_avatar/forum.metagrid.app/metagrid_admin/32/21_2.png) [@MetaGrid\_Admin](https://forum.metagrid.app/u/MetaGrid_Admin)\ **Post date:** [November 10, 2026, 11:19am UTC](https://forum.metagrid.app/t/metaserver-went-live-on-an-old-rc4-version-of-windows-midi-services-that-is-no-longer-available/1680/8 "2026-11-10T11:19:44Z")
Thanks, Pete, for clarifying which API to ship, and Brett for testing it. **MetaServer for Windows 6.0.6 (build 6022) is now available in the built-in updater.** It bundles the Preview 11 API on Windows 11 25H2 and later. If removing RC4 made your ports disappear, update MetaServer and reopen your DAW. The separate MIDI Tools and Transports packages are optional. [Download and release notes](https://forum.metagrid.app/t/1681/1)