Game not free from bugs

I have 4500 High Tech and 38,000 Energy. For a "Kerncentrale" (nuclear
fusion plant) I need 4000 High Tech and 30,000 Energy. But it is greyed out.
(The word "kerncentrale" should be "kernfusiecentrale" if it relates to a
future experiment with nuclear fusion.

Once I reached that requirement, but I lend 80,000 dollars and built it. But
because Water and Energy went wrong I discarded that city and reload the
city. I reached the requirement again, but there is no announcement that I
can build that "Kerncentrale".

Is there a patch that I can download?

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