Default [Q] S-Planner and Goole Calendar

On my Note 8, the S-Planner sync with my Google Calendar on my PC with no issues and visa versa.

On my Note 3, the S-Planner will not sync unless Google Calendar is also installed and active.

Why???
Is it the difference between 4.2 and 4.3, 4.4??

Is there anyway to just use the S-Planner and get it to sync with Note 8 and Desktop?

Thanks.