Plenty replies across on gimpchat.com, and as stated there, it is the difference between Gimp 2.8 and Gimp 2.10 using GEGL functions.
You need the old Gimp 2.8 blur-gauss.exe plugin (attached).
Un-zip, put blur-gauss.exe in your Gimp 2.10 user profile. C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\plug-ins
Gives this in my Win10 / Gimp 2.10.10 VM https://i.imgur.com/4rsVPwg.jpg
However, Gimp 2.10 already has a high-pass filter Filters -> Enhance -> High Pass The script 'low pass' is just a slightly blurred original.
If used for removing blemishes then the Gimp 2.10 Wavelet Decompose is similar, https://i.imgur.com/vDpuiwL.jpg Description here: https://patdavid.net/2011/12/getting-aro...ching.html
Edit: A quick comparison between Gimp 2.8 and Gimp 2.10 layer modes. Not quite the the same result due to the new modes. Probably ok but maybe work in legacy layer modes. Depends what you are doing.
You need the old Gimp 2.8 blur-gauss.exe plugin (attached).
Un-zip, put blur-gauss.exe in your Gimp 2.10 user profile. C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\plug-ins
Gives this in my Win10 / Gimp 2.10.10 VM https://i.imgur.com/4rsVPwg.jpg
However, Gimp 2.10 already has a high-pass filter Filters -> Enhance -> High Pass The script 'low pass' is just a slightly blurred original.
If used for removing blemishes then the Gimp 2.10 Wavelet Decompose is similar, https://i.imgur.com/vDpuiwL.jpg Description here: https://patdavid.net/2011/12/getting-aro...ching.html
Edit: A quick comparison between Gimp 2.8 and Gimp 2.10 layer modes. Not quite the the same result due to the new modes. Probably ok but maybe work in legacy layer modes. Depends what you are doing.