You need an internet connection to read publications (unless you pre-download PDFs via Chrome’s download manager).
"App crashes when I open a Bible book." Fix: Clear the app cache. Go to Chromebook Settings > Apps > Manage your apps > JW Library > Clear storage. jw library for chromebook
If you have a high-end Chromebook (like a Lenovo Duet, HP x360, or Acer Spin series) with a touchscreen and Android app support, You need an internet connection to read publications