In this folder you can find the libraries LPub3D uses:
C:\Users\[your user]\AppData\Local\LPub3D Software\LPub3D\libraries
Here you need to make sure the latest complete.zip is stored.
If you need non published parts available just copy/past those XX.dat files into the complete.zip file and restart LPub3D and voila the missing parts are visible and not anymore showing as ablack cube.
If you have sub parts consisting of a few parts and steps you can decide to move them to a call out. In below text it is briefly explained.
Continue reading Change a few steps to call out
This is a way to reduce the number of pages of your building instruction or leave out the pages with just a small number of steps. Below an example of a sub part with just 10 parts and 2 steps.
When a Lego piece consists of separate parts like a minifig or universal joint. Besides the replace with the PLI BEGIN SUB statement here.
Continue reading Sub Assembly ‘Treat as Part’