Thank you @Igazor. So, I have one more question. If the infected lots/households are deleted from an active game and the game installation is cleaned, can the saved game then be played safely? I haven't infected peoples' favorite games because they installed my park next door to their fifth generation legacy Sim, have I? And does the Sim get infected at creation or when shared?
And, yes, Angela created a newly renamed version of the lovely counter that had the code error. Angela's work is beautiful, after all. Which is why it ended up so widely spread. It's a shame she couldn't just create a corrected version of the counter with the same file name that could replace the damaged one and just make it harmless wherever it already existed. But I'm sure there are technical reasons why that didn't happen.