Because Toshiba has sold its printing division to Sharp, and because the e-Studio 181 is a legacy product, navigating manufacturer websites can be confusing. The drivers are often archived.
If you have exhausted all options and still cannot install a driver, consider connecting the e-Studio 181 via a (like a Raspberry Pi running CUPS), which acts as a modern bridge between the legacy printer and your new computers. toshiba e studio 181 printer driver download