Release version 2.9.5.0, Releases · 0xC0000054/gmic-8bf · GitHub
Changes:
- Updated to G’MIC version 2.9.5.
- Fixed an issue when loading PNG images from the clipboard.
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The Author of XnView, reported yesterday that the 64-bit works great with XnView 
Source: G'MIC plug in for XnView - XnView Software
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Release version 2.9.6.0, Releases · 0xC0000054/gmic-8bf · GitHub
Changes:
- Updated to G’MIC version 2.9.6.
- Fixed the error handling for hosts that ignore the plug-in error codes.
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I’ll test it with Affinity Photo and publish a tweet about it, thanks ! 
My trial version of Affinity has expired, won’t be able to test finally 
EDIT: Been able to test by reinstalling it on a new Windows VM. It works very well, kudos @PDN_GMIC!
Release version 2.9.6.1, https://github.com/0xC0000054/gmic-8bf/releases
Changes:
- Improved the error messages when launching the G’MIC-Qt process.
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Hi!
I added G’MIC to Affinity Photo, but it doesn’t work. Whenever I try to start it, I get the attached error message. Even with different input settings.
I have already worked with G’MIC in GIMP for many years, and it works pretty fine there. But unfortunately not in Affinity Photo.
Windows 10, 64 Bit, 8GB RAM. i7 8700 CPU, NVidia GeForce GTX 1060 6 GB, Affinity Photo 1.9.1.979
Edit: In the Preferences window, the Status of the G’MIC-plugin is displayed as “unknown” (see the attached screenshot).
That error message indicates that the G’MIC-Qt process cannot open one of the files it needs to load the image from Affinity Photo.
I am not able to reproduce it when running Affinity Photo 1.9.1.979 in a Windows 10 VM.
It could be that your antivirus or some other software has locked the files that G’MIC-Qt is trying to read.
That just means that the Affinity Photo developers have not tested the plug-in for compatibility.
Thanks for your reply! But I don’t really understand that. I have opened the images (jpeg and png) in Affinity Photo from the hard disc of my computer and other ones from an external hard disc. In some cases (can’t see the reason), if I try to start G’MIC, the error message appears, in other cases the G’MIC entry in the “filter”- menu is greyed out. I can manipulate those images absolutely normal in Affinity Photo. Only G’MIC doesn’t work. Could it possibly have to do with, that I bought Affinity Photo on the Microsoft Store?
Edit: I also tried out images from Unsplash and Pixabay. In that case the G’MIC entry is greyed out and inactive.
I do not think so, the Microsoft Store version should be the same program as the regular Affinity Photo install.
The plug-in only supports the RGB and Grayscale image modes with 8 bits-per-channel or 16 bits-per-channel.
That suspicion about the Microsoft Store is, because I can’t find the installation of Affinity Photo on my computer. I also have Affinity Designer installed, which I bought at the Serif Store, and it is - easy to find - installed in the Programs folder. But Photo is hidden somewhere. Can’t even find it with the Search-field in the Explorer.
“The plug-in only supports the RGB and Grayscale image modes with 8 bits-per-channel or 16 bits-per-channel.”
Seems that the greying out is caused by colour depths of 32 bits and unrasterized images. But the error message also apperars on rasterized 8- and 16-bits-images.
Maybe this is interesting: a guy in the Affinity forum got an error message too, and it seems that it depends on the Microsoft-Store-Version of Affinity Photo.
Microsoft Store apps are installed in a hidden folder that even Administrators do not have access to, only the operating system can write to those folders.
From the error message it appears that they are using the Input/Output Settings for G’MIC-Qt plug-in to set a second input image from a file.
The error message indicates that the G’MIC-Qt plugin cannot read the file that was set as a second input image because part of the file path is invalid.
The part that I do not understand is that according to its Microsoft Store page Affinity Photo can access any file on the users computer, so it should function the same as the version from Serif’s website.
But perhaps the Microsoft Store version does have some additional restrictions on what it is allowed to do.
My input/output settings are set to “None” and “Default Folder” (output). I don’t remember what the output was set in the default settings, but I can’t change it now. I can remove the hook from the checkbox and set another destination folder, but when I open the input/output-panel again, it the hook will be set again and the destination folder will be chnaged again to the former setting. Seems like this setting is now set for eternity.
Yes, it somehow seems to be a Microsoft issue. Only users who bought Affinity Photo in the Microsoft Store seem to have that problem. Even the Demo-Version of Affinity Photo works with G’MIC verry well, as other users reported. So better keep your fingers off the Microsoft Store!
Edit: As another user told me in the Affinity-Forum some minutes ago, other 8bf-Plug-ins like the NIK Collection and Topaz do work even with the PHOTO-Version from the Microsoft Store.
The fact that G’MIC-Qt cannot find the files that the 8bf plug-in writes makes me think that the Microsoft Store version is enforcing restrictions on accessing files between processes.
Some of Microsoft’s documentation on porting desktop apps like Affinity photo to the Microsoft Store appears to confirm this.
The NIK Collection plug-ins use a separate process, but I believe that it uses shared memory to communicate instead of writing temporary files to disk.
Release version 2.9.6.2, https://github.com/0xC0000054/gmic-8bf/releases
Changes:
- Fixed a data corruption issue when reading 16-bit images.
- Make the layer opaque if the G’MIC image does not have transparency and the host allows the layer transparency to be edited.
- Changed the location that the G’MIC-Qt images are written to, this should hopefully fix compatibility with the Microsoft Store version of Affinity Photo.
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Thanks @PDN_GMIC!
Today, I’ve seen a noticeable peak in the G’MIC home page stats these last days,it may be related to this video (posted 5 days ago).
Nicholas, it seems people are now aware of the plug-in for Affinity Photo. Again, good job!
I do hope that there would be more people looking into the gmic scripting language now that more people look at it as a universal plugin. That’s the biggest impact I’d like to see.
Just glad that G’MIC can now be shared across most if not all photo-editing programs. As I often say, G’MIC’s the gift that keeps on givens. Thanks a heap to David and his team as well as all the contributors that created presets for G’MIC. 
That video may also help explain why the 64-bit version of v2.9.6.1 has over 2000 downloads.
I am a little surprised how many people are asking if there is a macOS version in the comments on that video, you can easily tell that the video was not recorded on a Mac.
I added a note about the OS requirements to the release notes for version 2.9.6.2.
I have not had any feedback on whether the changes I made will now allow the plugin to work with the Microsoft Store version of Affinity Photo, I hope it does.