Back in the day the TT progam would uninstall itself (at your command) after you completed your taxes. However, for the past several years TT highly recommends that you keep the TT program for each year (in addition to copies of your return and worksheets) on your PC after filing taxes.
This feature came in very handy for me recently when I had to file amended returns for 3 prior years. TT retained my completed forms,which could be updated, and the rules in effect for those years. I had to mail in the amended returns. Could not E-file.