can't download v7.8.7 (I have v7.8.6) repeats "downloading&update & relaunch", but no new version

I have 1password v7.8.7. I've tried several times to download v7.8.6. It keeps repeating (Downloading) and (Update & Relaunch). But there is no new v7.8.6 on my applications file. I'm using Apple Mac...