Updating brave browser

I wanted to upgrade my brave browser on windows pc and i have some very important websites pinned on my browser so if I run the installer will it delete my pinned tab of will it stay unaffected.

Updating the browser should not change the state of your browser. If you want to be extra careful, I would recommend bookmarking all those tabs (you can do this by right-clicking on the tabs bar and selecting Bookmark all tabs..., just in case.