Ready for use

Error trapping added for back package version number. Cleaned up code to make it consistent. There is still an issue with the "Stop" button firing. Keep clicking on it and it will eventually catch.

Better background management

Improves background work management. Still has issue with stop button not firing immediately. If you keep clicking it, it will eventually fire.

Rough edges preview

This works for downloading a package and all of its dependencies but there are issues. Stop button is not working while gathering package information. May crash if there are issues downloading a package.