TurboTax 2021 is the current version and is used to prepare a 2021 return. Did you only recently install it, and having trouble with your first launch of the program? Or had you been running the program OK previously, but now it's trying to install an update that fails?
Did you install it from a 2021 CD or from a downloaded installation file? And are you referring to the Windows version or the Mac version?
If there's an updating issue, and if you are using the Windows version, you can try installing a manual update:
FAQ: Manual update for TurboTax for Windows personal tax products:
https://ttlc.intuit.com/turbotax-support/en-us/help-article/update-products/manually-update-turbotax...
