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.
Ubuntu / Debian
(1) Download the eurkey.deb file(2) Execute:
dpkg -i eurkey.deb setxkbmap eurkey