If the software is in your account then only you can login to it.
TurboTax is licensed to be installed on up to 5 computers that *you* own. You should have no problem logging into your own account. That does not mean that family members not residing in the same household can install your copy.
See license agreement.
2. Supplemental License Grant and Restrictions. In addition to the General License Grant you may: (i) install and use a copy of the Software on up to five (5) computers owned by you (at home or at work); (ii) use the Software only to prepare, print and/or electronically file your federal 2020 tax year returns and related state tax returns as described below; (iii) make one backup copy of the Software for your personal use as permitted under this license grant. Any software that is delivered by electronic transmission (regardless of whether a replacement copy is ordered) shall be deemed delivered on the date that Intuit makes such program available for download.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
