Place the plugin's compiled JS file in your module's js/build/ directory and then do the steps on the following slides.
You can try copying the complied plugin JS file from within the plugin library (it should be in a
/build/directory. It may work, it may not.CKEditor 5 DLL version requires all dependencies to match: if plugin specifies dependencies in old-style notation, they won't match and CKEditor will complain about duplicate libraries.
If your dependencies don't match, correct them in the plugin and recompile it, then try again with the newly compiled JS file.