Please open a support ticket at: https://templatetoaster.com/support, and provide your ttr file as attachment. Our support team will guide you accordingly.
I did have the same trouble for a month long.
The Solution for me has been:
Uninstall TTMake a backup of "C:\Users\<username>\AppData\Roaming\TemplateToaster\Bookmarks"Delete the original filesRebootReinstall and press "no" if install is asking your 2 recover files.