Well, I think this site has enough info in the d-load section telling you it, but ok...
THE HARD WAY:
backup all the original files in a directory
create a new directory with the modpack files in it
copy and paste the mod files to the Civ II main directory
THE EASY WAY:
Download the modpack manager
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And I'm proud to say: 'Ich bin ein Civfanatics Official Reviewer!'