Older versions of Grapher cannot open Grapher files that were created in newer versions (referred to as forward compatibility). For example, Grapher 14 cannot open Grapher 15 files.
This error typically occurs during one of two scenarios. Each are listed below, along with a solution:
Scenario 1: If you have recently re-installed, or transferred computers, it's possible you accidentally downloaded the wrong version. Open Grapher and click Help | Check for Update or File | Online | Check for Update, or, follow these instructions to download the newest installer you are eligible to use from our My Account portal: Download my software online.
Scenario 2: You received this file from another individual. Tell them what version you are running (click Help | About or File | About), and ask them to send the file in the version you are running. They can do this by clicking File | Save as and changing the Save as type to the appropriate version file type. You also might consider getting current with Grapher.
Contact us if you would like to add your vote to our suggestion file for forward compatibility. Our feature development is built on user votes!
Updated August 2019