Oh this is a first, I am unable to update it on the Itch.io app on windows, and what incompatible third-party website is that red message referring to? If I missed something, let me know. Man, I can just tell that this update will be awesome!
Seems Itch App does not allow downloading from third party sites.
Game can be downloaded manually from the above Download links, I used them twice and worked.
Game can also be downloaded from Patreon and Subscribestar.
Developer wrote 14 hours ago about hosting files on Itch.io:
I’m not able to at the moment, but it’s number 1 on my priority list.