stop download the game every time
try to download via itch.io app
or contact itch.io support and ask them why you can't download.
no i mean you stop upload the game full size pls just the update
I play games where patch size is usually above 20 GB and nobody complains. Is it problem to download 500 MB once in few weeks/month?
If you are ok to cover all expenses (few hundred $ every year), then i can implement patch system, but i am pretty sure you will not, so...
luanch it on steam