Sorry for not being specific. I was just thinking about some of the Slicer users I know who are MDs. I am not sure they would appreciate using terminal and learning about brew and casks. I can’t imagine them running the steps you listed in “Steps to upgrade Slicer app (for users)” on the page lab page you referenced.
For the users like above, the package is the dmg file that they download from the Slicer web page.