All the instructions for converting to LR instructs as a second step File>Plug-In..... this doesn't come up. What am I missing??
1. The actual command is File > Plug-in Extras > Import From Aperture Library. When you say "this doesn't come up", which part are you not finding -- the "Plug-in Extras" menu item, or the "Import From Aperture Library" menu item?
2. Do Help > System Info and report the exact version of LR you are running.