Press the Windows key > Type "2019 Lacerte Web Setup" > hit Enter

That will start the regular install which is much cleaner than the update process. Replace 2019 with any of the year, e.g. 2018 which has recent updates, to start the clean install of it.

If that fails, follow this FORCE install https://proconnect.intuit.com/community/help-articles/help/how-to-perform-a-force-install-of-lacerte...