itch.io

Itch tends to 403 downloads that take too long or for no reason at all. The only real way to prevent this is by using the Itch app, which exists for PC.

Progress shouldn't disappear when updating in Android, unless you do the uninstall-reinstall technique when updating. That is not how you update something in Android, unless GW's signatures change for every version, for whatever reason.

EDIT: Further confirmation shows that GW does NOT change signatures every version.

And here is how you update GW on Android, if you have an old version:

Step 1: Download the newer version

Step 2: Click on the downloaded file

Step 3: Click the followup "Update" button

Step 4: Wait

Simple as that.

Probably intentional. It's a repeatable scene, isn't linked to any missions or character N/H-Events, and is related to affection points instead.