If you have already purchased the TurboTax desktop software for 2018, sign onto your download account using the same User ID you used to purchase the software - https://shopping.turbotax.intuit.com/unified/downloads?route=myaccounts
TurboTax software purchased from TurboTax can be downloaded at any time for any reason as often as needed for up to three years from the purchase date.
If you have not purchased the 2018 desktop CD/Download editions, then go to this TurboTax website - https://turbotax.intuit.com/personal-taxes/cd-download/
