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You have the wrong manual for the game.

This computer game is basically the original board game and the manual you've got is for the board game, which should be fine – but (like it says on the box) this game follows the advanced Civilization rules and you've got the manual for the basic version. Trade is wrong, various techs & catastrophes aren't included or are explained incorrectly, and having more than 11 tech cards isn't impossible but is actually essential for winning the game.

You need to dump the version you're currently hosting and use the one for advanced Civ. hosted at broggs.org or (better but probably harder) get someone to find the actual manual for this computer game.