What I think happens most often is people "make" a sounds folder and then un-zips the custom sound pack into that folder. Most of the sound makers pack their zip/rar file with the "sounds" file included. So your tree should look like this....
C:\Hitech Creations\Aces High\sounds
instead they look like this....
C:\Hitech Creations\Aces High\sounds\sounds
To fix it I would copy the files from the second sounds folder and paste them into the first sounds folder and then delete the second.
C:\Hitech Creations\Aces High\sounds\sounds
To be clear, copy the folders and files from the RED sounds folder and paste them in the BLUE one, then delete the RED one.