The FittingFont file contains images of entities that appear on isometric drawings. This includes images of flanges, olets, gaskets, end images, column centers and so on.
Occasionally new images are added to the FittingFont file.
The latest version of the FittingFont file is dated 2018-04-30.
You can download this file, unzip it and then use it to replace the file of the same name in the AcornPipe program folder of each one of your computers that uses AcornPipe.
FittingFont file for AcornPipe