From Intuit - TurboTax:
Can I install TurboTax on multiple computers?
SOLVED•by TurboTax•56•Updated 1 year ago
Yes, you can install and activate the same copy of TurboTax on three different computers.
Note: When you activate the same copy of TurboTax on multiple computers, the maximum limit for the total number of tax returns that applies to your copy of TurboTax gets shared among your installations.
For example, if your TurboTax includes 8 paid returns and you already filed 3 returns from one computer and 2 from another, you can only file 3 more returns using the third computer (that is, 8 – (3+2) = 3).