Some issues with Exchange

Hi guys,
For quite some time now, I noticed an issue with installing add-ons. Whenever I click on install on Exchange, it takes extremely long until it appears in apps. Sometimes it takes a whole day.
Is that normal?

The other issue has to do with the add-on, Free Stock Search. For two or three months, I get a notification that the add-on was updated. And it appears anytime I restart my Mac.
Does anyone know why that is and what I can do to fix it? I had already contacted both adobe support and the developer, but none of them were able to fix it. I hope you can help me out.
Thanks

Ps. here is a screenshot of the notification.