The Web interface can be used with the Windows interface of Timeless Time & Expense or Timeless Project Tracking.  However, it cannot use MS Access as a database option.

If you are using MS Access, you must first install one of the other database options  and convert your database.  Reinstall Timeless Time & Expense Enterprise Windows, selecting the new database.  Be sure all clients are connecting to the new database.

Finally, install the web version of Timeless Time & Expense or Timeless Project Tracking, selecting the same database as the Windows interface uses.