# Authorization Error in Logic Pro

**URL:** <https://forum.soundradix.com/t/authorization-error-in-logic-pro/2681>\
**Category:** Radical1\
**Created:** [May 8, 2026, 9:50am UTC](https://forum.soundradix.com/t/authorization-error-in-logic-pro/2681 "2026-05-08T09:50:33Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Oran](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.soundradix.com/oran/32/195_2.png) [@Oran](https://forum.soundradix.com/u/Oran)\
**Post date:** [May 8, 2026, 9:50am UTC](https://forum.soundradix.com/t/authorization-error-in-logic-pro/2681/1 "2026-05-08T09:50:33Z")

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Heads up Logic Pro users,

If you encounter an Authorization Error ( **Error 6004** ) in **Logic Pro,** it might be due to an issue with the latest iLok License Manager ( **v5.10.5** ). Going back to iLok License Manager **v5.10.4** fixes the issue. Here’s how:

1. Download iLok License Manager version **5.10.4** from here: [https://assets.soundradix.com/downloads/support/LicenseSupportInstallerMac%205.10.4%20b5324-72ed0501.zip](https://assets.soundradix.com/downloads/support/LicenseSupportInstallerMac%205.10.4%20b5324-72ed0501.zip)
2. Run the Uninstaller: Unzip the downloaded file, open the **.dmg,** and run **Uninstall License Support**. You must uninstall 5.10.5 first to ensure a clean downgrade.
3. Install 5.10.4: Run the **License Support.pkg** file.
4. Verify in Logic Pro: Launch Logic Pro. Radical1 should now load successfully.

**Troubleshooting**

If the error persists, restart your Mac, launch Logic Pro, and go to the Logic Pro Plug-in Manager (Logic Pro menu → Settings → Plug-in Manager), locate Radical1, and click Reset & Rescan Selection.

We’ve reported this issue to PACE. If you haven’t updated to the latest iLok License Manager 5.10.5 just yet, we advise waiting for the next update.

If you still have any issues, please send us an email to [support@soundradix.com](mailto:support@soundradix.com).

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**Author:** ![spindizzy](https://avatars.discourse-cdn.com/v4/letter/s/67e7ee/32.png) [@spindizzy](https://forum.soundradix.com/u/spindizzy)\
**Post date:** [May 31, 2026, 8:48am UTC](https://forum.soundradix.com/t/authorization-error-in-logic-pro/2681/2 "2026-05-31T08:48:22Z")

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Did all that but it still wasn’t showing.

In the end I had to delete and rebuild Logic Pro prefs for it to show up in instruments again.

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**Author:** ![Oran](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.soundradix.com/oran/32/195_2.png) [@Oran](https://forum.soundradix.com/u/Oran)\
**Post date:** [May 31, 2026, 9:34am UTC](https://forum.soundradix.com/t/authorization-error-in-logic-pro/2681/3 "2026-05-31T09:34:39Z")

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Sorry for the hassle, and glad to hear you’re up and running

I couldn’t reproduce when going from Radical1 v0.9.4 to v0.9.5 using Logic Pro 12.2. We’ll keep an eye out for this issue.

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**Author:** ![spindizzy](https://avatars.discourse-cdn.com/v4/letter/s/67e7ee/32.png) [@spindizzy](https://forum.soundradix.com/u/spindizzy)\
**Post date:** [May 31, 2026, 1:41pm UTC](https://forum.soundradix.com/t/authorization-error-in-logic-pro/2681/4 "2026-05-31T13:41:33Z")

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Appreciate the support all the same and it’s a great sounding synth.