I myself love the frequent updates but understand where you're coming from. Perhaps you can install/upgrade via your package manager, on macos at least homebrew has Calibre (and his other project kitty) available as casks.
Using Homebrew Cask for Calibre actually makes the problem worse because the download is consistently very slow for some people. For me, it took around an hour the last time I had it installed on my Mac.
https://github.com/Homebrew/homebrew-cask/issues/104814