Yes. On your MacBook, on that track's channel strip, you're probably seeing the plug-in as not available.
The MIDI data is only music performance data (which note, when, how loud etc...) but not audio. It needs to be routed to an instrument (such as a software instrument plug-in) to produce sound.
If you're seeing the notes in the Piano Roll when you double-click a MIDI region, you haven't lost anything.