As you were,
Just spotted what I missed, the line before the actual layer conversions reads as follows
<LayerConv items="1"> all I needed to do was change
1 to match the number of "items" I had which in this case is
99
AC versions 3.41 to 25 (UKI Full 5005).
Using AC25 5005 UKI FULL
Mac OSX 10.15.7 (19G2021) Mac Pro-2013 32gbRam AMD FirePro D500 3072 MB graphics