yeah the only problem with the Itch.io app, it installs on the C drive only, where as the C drive is just OS, when I can put the app on another drive then it will be usefull. until then ill just Dl, the full update, yes I know you can make short cuts to trick the os,
Itch IO app also need NET Framework which must be install on System drive and no excuse.
But you can change where Itch download and install game in preference > Install location
[Photo] default install location
Once you choose a new install location, click on your new location on the list again to mark it as default install location
[Photo] new install location [Drive D:\ has been selected as default install location]
If you want to change the install location of Itch itself, contact Itch app developers using [Feedback] on the top left of this page and ask.
Hope you have a good day.