I had 1.80 installed for a short while, but I did not notice that it asked for credentials. That version seemed a little buggy, took quite some convincing to update new thumbnails, an old problem, but seemed worse on that version.
With 1.90 it has so far only asked for credentials once, the first time I launched it.
I do not use any imaging cloud features.
I am not sure, but this last version seems a little faster updating images that have not had any edits added, also when zoomed in - quite useful when adding initial star ratings before edits.