This looks like a larger issue. I have copies of both TurboTax for Business (Partnership/Trusts) as well as TurboTax Business (for sole proprietors/schedule C). The latter was installed several weeks ago and was operational, including updates. The Business (Partnership/Trusts) just installed yesterday. Both downloaded updates and now fail with a Microsoft Installer Error 1603. Once this error is encountered, I'm prevented from further use of the software. Using Win 8.1, with all updates installed, I'm logged on as an administrator. I've tried turning off the firewall, as well as antivirus software (both are embedded in Win 8.1), all with the same negative results. I need a solution ... any help will be appreciated.
