Installing Map.XL add-in is very simple.
1) unzip content of this foder to directory, where you have full right access (e.g. "My Documents")
2) double-click on the setup.exe file
3) confirm the installation
4) after the installation, start MS Excel application
In the case of any question, comment or problem, feel free to contact me: milos.gregor@gisxl.com