It may not be the issue as my change to paint-net did not solve it.
But using paint-net is not the issue either.
To be consistent, I uninstalled and re-installed to the common path again:
PS C:\Program Files\paint.net> dir .\Effects\
Directory: C:\Program Files\paint.net\Effects
Mode LastWriteTime Length Name
---- ------------- ------ ----
d----- 1/16/2024 6:51 PM AnalogEfexPro2
d----- 1/16/2024 6:51 PM Color Efex Pro 4
d----- 1/16/2024 6:51 PM Dfine 2
d----- 1/16/2024 6:51 PM examples
d----- 1/16/2024 6:51 PM HDR Efex Pro 2
d----- 1/16/2024 6:51 PM PSFilterPdn
d----- 1/16/2024 6:51 PM Selective Tool
d----- 1/16/2024 6:51 PM Sharpener Pro 3
d----- 1/16/2024 6:51 PM Silver Efex Pro 2
d----- 1/16/2024 6:51 PM Viveza 2
Sadly with the same result, that no filter shows to be chosen in the 8bf Filter menu.
Here I add the content of the PSFilterPdn folder:
PS C:\Program Files\paint.net\Effects> dir .\PSFilterPdn\
Directory: C:\Program Files\paint.net\Effects\PSFilterPdn
Mode LastWriteTime Length Name
---- ------------- ------ ----
-a---- 10/13/2023 9:00 AM 28160 CommunityToolkit.HighPerformance.dll
-a---- 6/28/2023 12:30 AM 11776 MessagePack.Annotations.dll
-a---- 6/28/2023 12:30 AM 326144 MessagePack.dll
-a---- 4/26/2023 6:07 AM 30856 Microsoft.NET.StringTools.dll
-a---- 11/30/2022 4:56 AM 42496 PointerToolkit.dll
-a---- 7/21/2023 10:32 PM 357376 PointerToolkit.TerraFX.Interop.Windows.dll
-a---- 10/13/2023 9:00 AM 17130 PSFilterPdn.deps.json
-a---- 10/13/2023 9:00 AM 483840 PSFilterPdn.dll
-a---- 10/13/2023 9:00 AM 180480 PSFilterPdn.pdb
-a---- 10/13/2023 8:59 AM 25678095 PSFilterShim.exe
-a---- 10/13/2023 8:59 AM 136004 PSFilterShim.pdb
-a---- 10/13/2023 9:00 AM 555008 TerraFX.Interop.Windows.dll
And one of the Filter folders, too:
PS C:\Program Files\paint.net\Effects> dir '.\Analog Efex Pro 2\'
Directory: C:\Program Files\paint.net\Effects\Analog Efex Pro 2
Mode LastWriteTime Length Name
---- ------------- ------ ----
-a---- 10/14/2023 6:33 PM 1228 Analog Efex Pro 2.8bf(64Bit).8bf.lnk
-a---- 10/14/2023 6:33 PM 1075 Analog Efex Pro 2.8bf.lnk
-a---- 7/10/2015 7:43 PM 1160 AnalogEfexPro2.config