Sorry, it's not technically possible to download some updates separetly, usually it's all-in-one game build.
It's not a big deal to send you the update, if you can't download it on Itch.
Write me PM (Zuleyka#7052) in our Discord https://discord.com/invite/4q9YJgm
Also we've next pre-releases Wonder Slave 0.8 on Subscribestar: https://subscribestar.adult/zuleyka
It will be available on Itch after 0.9 release.
Cheers!