Native Access 1 "Install" button when adding sounds to a library not working

Hi all,

I am using Version 1 of Native Access because Virtual Drumline cannot be downloaded on the newer version of Native Access. When I click on "browse" and add the correct folder, the "Install" button does not turn blue. I know it is the correct folder because when I add an incorrect folder, I get a message that says that I selected the incorrect folder. I have tried restarting the program, my computer, and redownloading the sounds altogether and none of it has worked. I attached a picture of what I am seeing. Any suggestions would be greatly appreciated.