Dear maxwin,
if you're new to perl, the first step is to get Perl form Activestate. After you've installed Perl you need to get the HTML::Template modul. You can install modules easily using ppm - a commandline tool included in the Activestate distribution of Perl. That's well documented at the activestate site. To use the 'Exchange Log Analyzer' you'll have to create a new Webfolder in your IIS and put the .pl and the .tmpl-file into this folder. At this place the script also expects the .log files.

To be fair I have to say that the script is a proof of concept and is not designed for a production enviroment. It isn't secure so you shouldn't use it accessible from the internet.

best regards, neniro