On a clean PC, run the UPD executable but cancel the installer. Instead, go to C:\Users\[YourName]\AppData\Local\Temp and look for a folder named 7zSxxxx.tmp . Inside, you will find the raw driver files. Copy the entire folder to your USB drive: E:\ToshibaDrivers\eSTUDIO2303A_UPD\
Toshiba’s official support site (search for e-STUDIO2303A). Avoid third-party “portable driver” download sites—they often contain malware. toshiba e studio 2303a driver windows 10 portable