I previously downloaded and worked on my TurboTax. Now when I go back in, call up and select "update" it says it can not. How do I update?

Three things to try:

1) Shut down TTX and rt-click on the TTX icon and make sure you select Run As Administrator...and try again.

or

2)  A Microsoft update was issued this week...check for full installation of that first.....and reboot whether or not one is waiting.  then try again.

or

3)  If #2 doesn't work, download and install the Manual Update instead....make sure it is working OK, then go grab a snack for 15-20 minutes and come back and re-check...the manual update can take a while to get done.  Once TTX is restarted...run the internal update again (sometimes the manual update is one version behind).

Manually Update TurboTax for Windows Software (intuit.com)