Ye Olde Guy wrote:
GIMP Version: 2.8.14
Operating System: Windows
GIMP Experience: Basic Level
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I read there was a Descreening option under Filters\Enhance, but I do not see it in the newest version of the software (3.10.38).
Indeed, but it's a script-fu which need the fourrier plugin (FFT)
I have it and would have loved to share it but I'm on Linux, only the script-fu will be compatible with your system, and it will not work without the Microsoft's windows file type "fourrier.exe" or "fourrier.dll" or alike.
(maybe rich2005 has it for Windows)
You better off with G'MIC >>
https://gmic.eu download, install, restart GIMP, first time launch G'MIC (in GIMP go to Filters > G'MIC_Qt) update filters, then you have plenty way to descreen in GIMP via G'MIC (there is search box)