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My older iMac desktop is running High Sierra, & when I ran TurboTax on it last year, it told me that I would need at least Mojave to run it this year. So, no, you will not be able to use it running High Sierra. (I went out & got a newer iMac desktop, pre-owned, that will take the newer operating systems.)
Sorry, there was a problem. Please try again later.Don't know what high Sierra box said will run Mac Mojave and higher
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