The only thing I can suggest is to follow audge66's suggestion, i.e., specifically search for "~/Library":
"I wound up spending 2 1/2 hours with a wonderful woman from TurboTax support. I’d tried the uninstall, but couldn’t find the TurboTax extensions mentioned in the article on how to fix. I’d been entering /Library in the Finder window, not ~/Library. It turns out that the “~” was really important to finding those files and deleting them."
