First release that I believe is some what useable
If you ever used any of the past test releases, there were some changes to how downloaded works and filter data are stored, there is a function built in to attempt to convert, but you may still run into some issues.
Thank you to @thedeadparrot for this pull request:#2
UPDATE: There was a bug with the file format updating system, which is fixed in this version: https://github.com/IntrovertedMage/AO3Downloader.koplugin/releases/tag/v0.1.1