Hello Jhonnatan,
Welcome to the Community!
The project you have is probably an old AS 2.x project. You need to know which version of Automation Studio it was opened in.
To find out, open the .GDM file as text (right-click, Open With > Notepad). Turn on Word Wrap or scroll to the right until you see a version (indicated by the ‘V’), and maybe Automation Studio and the date it was last opened (depending on how old it is).
Fig 1. Example of .GDM project last opened with AS v2.7.0.25.
If the Automation Studio version is greater than v2.5.3, then I’d recommend upgrading to AS v2.7. It is still available from the B&R Website. Link
If it is an older version of AS then you may need to request that version from the local support team. Since you are located in the US, you can email your request to support.us@br-automation.com.
(Note this is legacy software without current cybersecurity considerations and current OS support. You will need a Windows XP, Vista🤣, or Windows 7 OS to install it under.)
-Austin