Is it true we can download TTU before W-2 print

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Is it true that we can now download the TTU before printing W-2s and this wont recalculate the the taxes?

Is this due to the Aatrix interface?

I just had a client call and say they spoke with someone at Sage support and was told they could download and install the IRD and TTU and no longer worry about taxes recalculating, and causing a problem with the W-2 taxes recalculating.

Is this the case with 4.5, 2013 and 2014?

If this is true, this is good news!