Go to the official page. Select fi Series from the product lineup. Choose fi-6110 as your specific model. Select Windows 11 as your operating system.
However, because the fi-6110 was designed during the Windows XP through Windows 8 eras, making it work on poses a compatibility challenge. Fujitsu's scanner division (now transitioned under the Ricoh brand) does not offer an official, native Windows 11 driver package specifically tailored for this legacy model. fujitsu fi6110 driver windows 11