The GUI is now made of a stack which has two boxes in it. One box contains all the normal GUI elements, the other contains a file chooser button and a normal button to call an update routine. This box is only displayed if an issue is found. I decided to track the install status via a preference boolean, rather than calling df_check_if_bin_exists at startup every time. I do this because on my windows PC I was starting to get slow startups with too many scripts installed and many many flashing CMD windows at startup as well, which was a nuisance.
Scripts in this folder are meant to have an "owner" who maintains them.