---How to install Calcsys -Use the graphlink software to insall the calcsys.8xk file onto your calculator. You'll need at least version 2.0 of the software, so upgrade if you have an older version. --If you are having trouble, make sure of the following: -Your TI-83 Plus is on the homescreen. -You can communicate correctly with your TI-83 Plus using the regular graphlink software (if you can't this is a problem you have to take up with TI tech support) -No other graphlink or application install programs are currently running. -You have at least 16K of free archive space. -Your batteries are not low. -Your graphlink is connected to your calculator -You are using the latest version of the graphlink software