As you know, aTube Catcher is a software in constant development, there is a couple of very known bugs, currently being solved, please be patient and stay in touch to get the latest update with those bugs fixed:
Version affected: 2.3.570. After download a video, in the "Select task dialog", when the user selects "Copy to", the file is not copied but only when the user chooses a root drive path, only works with subdirectories. This will be fixed in the next revision. Let me know if you need this bug-fix. This fix will be available in the Unofficial builds very soon.
Please install the latest release to correct these bugs