Firstly, use the attached code for 16.3.
Unzip it and place it in the skill folder underneath the folder defined by your allegro_site environment variable. (You may need to create the folder).
Create the allegro.ilinit file (in the same folder) if it doesn't exist.
Add the two lines:
axlCmdRegister("silkutils" 'ASU_start ?cmdType "interactive")