Before you start first, you've to login into your turbotax account using the same credentials you used to make your purchase.
If you're a new turbotax user then create a new turbotax account.
Now, it will shows you the installturbotax.com download option click on it and wait until the downloading procedure is completed.
Once the downloading procedure is completed go to the file explorer of device.
Open the download folder or go to the location where the downloaded turbotax file appears.
After this, double-click on the turbotax downloaded file which contains the file name and tax year.
Click on the Install option and wait until the installation procedure is completed.
When the installation procedure is completed click on the Finish option.
Enter the installation key and click on the Next option.
At last, select the activation method through online activation methods.
Finally, you've successfully downloaded the turbotax.