Unable to select a file path for the home button

Hello. I’m new to SIRIL, and I’m attempting to set it up. I created a SIRIL folder on my D: drive, with the four sub-folders FLATS, BIASES, DARKS, LIGHTS. When I click on the home button, I get the pop-up that’s supposed to allow me to choose the file path. But no matter which file I select, it doesn’t allow me to open the path (i.e., there is no OPEN button on the pop-up). But from what I can see, it looks like it automatically pre-selected a file path, on its own. I did a complete uninstall, then reinstalled it, and it chooses the same path.

I’m at a complete loss, as how to proceed. Any assistance would be appreciated.

Thank you

The open button is located at the bottom right:

If you don’t see it, reduce the dialog size.