Even with the correct Toshiba e-Studio 256 scanner driver, errors occur. Here is the fix for the top 3 problems.
Because official drivers are old, enthusiasts discovered that VueScan (commercial) and NAPS2 (free, open-source) fully support the e-STUDIO 256’s network scan function. VueScan even supports the TWAIN-over-network protocol that Toshiba’s own drivers sometimes fail to initialize. toshiba e-studio 256 scanner driver
When you download, you will typically see a zip file named something like:
eSTUDIO256_XXX_W64_xxx.zip
Inside, look for the TWAIN_64 folder. The setup executable is usually Setup.exe or Install.exe. Even with the correct Toshiba e-Studio 256 scanner