When you download Uniconta and click "Create user", you need to be aware of which browser you are using, as each browser downloads files from different places.
See here where the installer is downloaded in your browser.
In Chrome and Windows Edge it is at the bottom of the screen
Internet Explorer
In Internet Explorer it is at the bottom of the screen
Firefox
In Firefox it is from the toolbar
Windows Edge and Chrome
In Chrome and Windows Edge it is at the bottom of the screen
Internet Explorer
In Internet Explorer it is at the bottom of the screen
Firefox
In Firefox it is from the toolbar