Windows
(1) Uncompress the zip file onto the desktop. There will be a new folder named eurkey.(2) Execute EurKEY.msi.
(3) Choose the new keyboard layout by clicking on Start - Control Panel - Regional and Language Options.
(Start - Run: intl.cpl ,1 or RunDll32.exe shell32.dll,Control_RunDLL intl.cpl,,2 might be faster.)
(4) Relogin or, in case you have already used an older version of EurKEY restart the computer.
(5) Enjoy.
Linux
(1) Download the latest Xmodmap file(2) xmodmap <file name>