thanks for your feedback and reports, I'd be happy if they are added as issues on github.
as said in the separate comment, I really wanted an app to be as "grandma-proof" as possible, therefore I really wanted to have one binary that does the magic for you. it's a karaoke app, not a tool that is aimed at engineers.
we can indeed look at the local packages before downloading an executable, it's just not done yet but might be added in the future.
I've built this project out of passion and it's 100% open-source and free, so please keep this in mind when criticizing.