I feel really stupid, but I don't understand where I can download the latest version for Android or how.
I've always downloaded from Itch.io, so I don't know what the correct download is to update to the latest public version.
If you click the ‘download’ button it will take you to their website where you can find links to the files.
Alternatively, here is a direct link:
https://blackcatstudiosdev.com/store/p/xpw66sekzbm9h7l-49m72-23d63-p9djn-tpwjl-565ar-8fmeg-9kzy6-5hjxt
