The exact message when trying to apply the patch is: 'hunks' - 4 out of 5 hunks failed, see attached image.
It was at this point, it occurred to me that the patch might only apply to 23.7.3 & not 23.7.10_1..
It was at this point, it occurred to me that the patch might only apply to 23.7.3 & not 23.7.10_1..