ON1 Photo RAW issue in Lightroom Classic 8.4

So, naturally an ON1 forum exists. And this very problem is discussed. Apparently known bug ( in ON1 ):

Lightroom won't start ON1 Effects Plug-In – ON1 Support

OK, for this issue, I went and did the following in order to make sure I was starting from a clean slate, just in case some old OnOne bits of code were still installed

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On my MACBook Pro

1. Uninstalled (removed) OnOne Photo RAW 2019. At first I fouled up and simly dragged the app into the trash. But dang it, an actual uninstller script exists. So ran that as well, and various bits of lotsam got cleand up.

2. In Lightroom Classic, deleted the Additional External Editor Presets for the OnOne Photo RAW 2019 apps. Closed LR.

3. For Lightroom Classic, Removed from the appropriate file location remaining OnOne Photo RAW 2019 (including Develop, Effects, Portrait, and Resize) all Plug-ins, and Presets, and templates.

5. Relaunch LR. Verified in Lightroom Classic that all of that OnOne support was gone. The Additional Extenal Editors (Develop, Effects, Portrait, and Resize), the Plugins, and the Plugin Extras. Closed LR

6. Reinstalled OnOne Photo RAW 2019.

7. Went back in to PS and LR Classic, verified it was all put back together. Additional External Editors (Develop, Effects, Portrait, and Resize), THe Plugins, and the Plugin Extras.

8. No joy, The Additional External Editors do not bring up On One . The Plugin Extras work.

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On My WIN 10 Wksta

1. Did the complete OnOne Photo RAW 2019 uninstall, Did the Install, and it works. No issues on this rig.

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BACK to THE MACBOOK

1. Now I can add and Additional External Editor, this one for On One Photo RAW 20019, the application, That works, and then do whatever I want from that starting point.

Windows or MAC?

Some additional links;

Yes edit in can still work, but not preferred per this:

Using ON1 Photo RAW 2019 with Adobe Lightroom Classic CC – ON1 Support

Ok, was going to provide link showing file oaths for plug-ins in edit in, can not find, probably right under my nose.

jacgad  wrote LR classic Release 8.4. Link to OnOne Photo Raw Broken. Is set in Preferences Message was edited by: Sahil Chawla

What release of OnOne PhotoRAW?

Where in Preferences are you looking?

And, perhaps you are looking in the wrong place, if 2019 for one, not edit in, but as shown in:

Using Photo RAW 2019 as a Plug-in – ON1

And this one for 2017:

Accessing From Lightroom – ON1

If you had the old Photo 10, then it was Edit In:

ON1 Photo 10 – Accessing from Lightroom – ON1

Also, check your plug-ins via plug-in manager

I have ON1 Photo Raw 2018 not the latest version and it still works for me on my iMac 27" mid-2015 and macOS 10.14.6

Hi there,

Could you please try reinstalling ON1 Photo RAW again and let us know if it helps?

ON1 Photo RAW 2019.6 Release Notes and Installation Instructions – ON1 Support

Also, could you please share a screenshot of the issue?

Regards,
Sahil