Smart Notebook is going away. You’ll want to migrate/convert your .notebook files.
We recommend converting them into Google Slides (Powerpoint).
This
has to be done from a Windows PC (At least the first part.)
Open your file in Smart Notebook, then click File -> Export As -> Powerpoint…
Save the file into your Google Drive. The easiest way is just to click on G:/My Drive
The rest of the process does NOT have to be done on a Windows computer.
It can be done on a Chrome Laptop.
Open the Web Browser (Google Chrome) and go to Google Drive (https://drive.google.com)
It may take a minute, but the Powerpoint you saved should show up here.
Now we'll follow the guide for converting Microsoft files to Google files:
You’ll notice the layout is a little weird. It’s portrait instead of Landscape.
Click File -> Page Setup
Change to Widescreen 16:9, then click Apply
Some things may be incorrectly sized, or spaced. Go through and fix anything that doesn’t look correct.
Related:
How do I convert Smartnotebook files?
How do I use smartnotebook files in Google Drive?