How to install packages from the browser

How do I install packages from the browser that are not in appcenter (.tar .gz)

Which browser are you trying to install?

.tar .gz applications have to be bundled with a Flatpak. The Endless OS is only compatible with Flatpak applications


Apps, not the browser

e.g. qjoypad …

Did you read the articles posted by @LeandroStanger above?