Using licence on 2 computers

[SaanichGAS]

I have installed the Desktop version (which I downloaded from TurboTax.ca) on one system. When my son downloads and installs on a 2nd system (I am licensed for 3 as stated above) using the same license code, he receives Error code 603. Something here is amiss. How do I get past this error?

[TurboTaxSusan]

@SaanichGAS Your son has to log into the same account that you used when you first used your licence code. 

[YOW18]

I bought a new computer, and try to active : 2025 premier desk version to this new computer.it says code has been used,  what should I do to get it working on my new computer

[YOW18]

I bought new computer, and use same account , after I download to my new computer,  it already showing access key code and saying it has been download,  that is final, i cannot do anything .  how do i do i get it going