With Chrome you can Right Click on Install Kaiser and choose Open link in New tab
You must then choose Keep
Then you click the file to run it.
Or you can optionally choose Download setup.exe and open the file to begin the Setup of Kaiser
Firefox will prompt to Save File
Look for the download to complete with the Down arrow near the top Right as in the picture.
Click the down arrow and click file to open it
Edge will prompt to Open File
Then you will be prompted to Install
Brave, Opera and many others may show the download in the bottom left of the browser window.
you can click Keep, Open or Allow or click on the file to get the installation to start.
These are based on the browser you are using and may vary betwen them.
Every Browser will be different and have its own methods
Most broswers require multiple steps to get a program installed. These are never automatic. Download and Install are not the same. A file is downloaded first and then it is opened or run to Install
You can always choose Download setup.exe then Run or Open it to install
Sometimes a virus checker will prevent setup.exe from being downloaded becase it thinks the file is not wanted.
If you are prompted or warned that the file is not common or may be unsafe you may have to procced with Run Anyway.