Final Draft defaults to only looking for newer FDX files. It doesn't know you want it to look for the older Final Draft file format, FDR.
1. Open Final Draft;
2. Go to File > Open;
3. At the bottom of the Open window, adjust the Files of Type dropdown menu to Final Draft 5-7 Documents (FDR); now all Final Draft 5-7 files will be visible;
4. Navigate to where your .FDR file is saved;
5. Double-click the file and it will open.
You will see a prompt advising you that you're about to open an older version of the file; dismiss this prompt.
Once this script has been saved in the current installed version, you do not have to follow the steps in this article again to re-open it.
You will have to follow the steps in this article for any scripts that have not yet been opened and saved in the current installed version.
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https://fd.support/3NhdE0B