Windows 10 update from 1703 to 1803 (skip 1709) offline

After searching alot i was unable to find a proper solution.
My situation is something like this.
I am on build 1703 (15063.674) and i want to upgrade it to 1803. Skipping version 1709.
I want to do this offline as i have limited data. I have enough data to download builds but windows update is slow (stops for no reason sometimes) and doesn't manage data well. So the only option left to me is offline.
Tried windows 10 update assistant but it gets stuck mid-way and fails to resume. My bad luck is a major ongoing factor.
I can download from Microsoft catalogue.
Do i have to first install cumulative updates for 1703?
After that direct update to 1803?
Sorry for all the trouble.
Just guide me into the general direction.
Thanks