If you purchased the software from TurboTax as a download then you can download the installation file at any time for any reason as often as needed for up to three years from the date the software was purchased.
Go to this TurboTax website and sign onto your download account - https://shopping.turbotax.intuit.com/unified/downloads?route=myaccounts
If you purchased the CD of the TurboTax software then contact TurboTax support and request that they push an installation file to your download account.
Use this website to contact TurboTax support during business hours - https://support.turbotax.intuit.com/contact/
Support can also be reached by messaging them on these pages https://www.facebook.com/turbotax/ and https://twitter.com/TeamTurboTax
You will also have to copy and transfer any tax data files and saved PDF's of your tax returns from the old computer to the new computer. The files are saved by default in the Documents directory and in the TurboTax folder.
