To clarify your current issue, we would like to know which version were you using. Could you please send us the vboard file and screenshot of instance ID which can be located by clicking the Gear icon on the top right and clicking "i" icon and then sending it to email@example.com or paste here?
(Please send this screenshot to us)
And, could you please try to rename "Sorting.notebook.olf to Sorting_notebook.olf" and see if that works on your IFP?
At last, the windows icon is the apk download link for the Windows device, not mac. But the good news is you can find our application on the Google play store, so you can still download and install it on your Chromebook and you can use it at home.
Feel free to ask back any questions and let us know how it goes. We will keep working with you until it's resolved.