In order to install LUWRAIN on Microsoft Windows, you should obtain the LUWRAIN self-extracting distribution and just launch it. The distribution can be easily downloaded as a single binary file from this page. Please ensure that the version of Microsoft Windows you are running is listed as a supported version on the page with the distribution.
You don't need an administrative privilege to run the LUWRAIN setup.
During the installation, LUWRAIN doesn't ask any questions
and always puts its files to AppData\Local\Luwrain in the profile directory of current the user
After the installation is finished,
LUWRAIN starts automatically,
and you should hear its greeting sounds.