I am using old computer, that is not connected to the internet, to run some calcuations, the activation will not stay active.

[RonRector]

I am using old computer, that is not connected to the internet, to run some calculations, the activation will not stay active. Note: I connected to the internet and activated it initially. I have several activation keys that I have bought over the years.How do I make it stay activated, off line.

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