I saw here that GoAccess can be installed on Windows. I would like to use it with ISS 8.5 log files but I cannot find any tutorial about how this can be used in Windows through Cygwin.
Any help?
You need to install Cygwin. There are a lot of tutorials out there on how to do that.
Then you will need to install in cygwin at least the following packages:
wget
libGeoIP-devel
libncurses-devel
libncursesw10
gcc-core
make
automake
gettext
Then compile GoAccess as indicated in the download page.
$ wget http://tar.goaccess.io/goaccess-1.1.1.tar.gz
$ tar -xzvf goaccess-1.1.1.tar.gz
$ cd goaccess-1.1.1/
$ ./configure --enable-geoip --enable-utf8
$ make
# make install