If you use an older version than 1.2.0, please use the full installer. Please completely uninstall any previous versions including liveries, prior to installing Version 1.2.1. If you already have Version 1.2.0, you can update using the Hotfix installer.
For those customers who purchased the Ultimate 757 prior to May 5, 2019, please be aware that we have discontinued the use of the Add-On Manager. Please refer to the 757 Support Page for more information on this change and the process to convert your product to our new system.