Note: this build is "old" but will self update with changes in the 6.1.7 branch and therefore doesn't require us to release a new "client".
You can review activity here: https://github.com/manga-download/hakuneko/commits/6.1.7
This build has passed the pre-flight tests #955 and is therefore considered as stable.
The installer packages will automatically find your previous settings after installation.
For the portable packages the User Data Directory needs to be copied to the new version.