I suspect there is currently a server issue or something on Oracle/MySQL's end, I have tried the 8.0.22 and 5.7.33 Web installers and neither of them are able to find the list of packages to install.

One solution is to download the larger offline installer.

First you must uninstall the MySQL Web Installer, this can be done by opening Apps & Features, finding MySQL Installer - Community and clicking Uninstall.

Then from the MySQL Downloads page, download the larger 400MB MSI installer, once launched you should see a list of Available Products to choose from