Hey NF!
We do offer a patch system over on our Patreon (even the free version). Where you can update from X version to X and it, on average, is around 400ish MB. (You can only update the highres game with the highres patch and compressed with compressed, you can't mix or match).
The latest free version (8.0.3) can be found here:
You'll need a Patreon account to download but you can create a free account if you don't have one already.