i have installed the app recently and for the first time use this app when i click on the intergration tab and click on connect to any platform it doesn't work at all nothing pop up if someone have had the same problem please tell what should i do i downloaded this app for this feature and nothing happens when i click on "connect"

If it's one of the official integrations — Epic Games or Xbox Live — open a support ticket. Tell the chatbot "other" right from the start. It should then ask what kind of problem you have; click "Other" from the choices offered. At that point, it should prompt you for information to open a support ticket.

If it's Steam, the latest release on ABaumher's GitHub supposedly works.

For the others, I don't know. Check if there's a solution in the GOG Galaxy forum.