I never actually learnt how to update these types of games. so how do I do that without just breaking everything?
If on android you just install the new apk and it should overwrite the old version without affecting save files.
The issue I've found is some developers change a lot of code and then the new versions don't work but never been the case with lust odyssey.
If your on pc just download the new version, open it up and open your save. then you can delete the old version.