MacOS v25.5.31.2363 not opening

I have been unable to get Manager to recognize my data files for months, so I just downloaded the newest version (v25.5.31.2363) and installed according to instructions on my MacBook Pro (13-inch M1, 2020) running Sequoia 15.5.

Now it opens to a blank window that simply says “Manager” at the top and does nothing else. My only option under the File menu is “close”.

Can anyone help here? I really need to get my data entered since February. Thanks!