BeatmapExporter 2.0 represents the release of a GUI with a full interface (rather than the original command-line-only program).
BeatmapExporter has been re-organized in a way that allows the both the existing command-line program (CLI) and the newer program (GUI) to continue to be available and receive updates. If the GUI program does not work on your system, or you are just more comfortable using the existing program, you can continue to use it with very little change made.
I hope that the GUI works well, and in theory should work across platforms and different systems. However, I have only realistically designed it for and tested it on my own system, and I have not worked with any GUI framework before. If there are issues with it on your system, please do file an issue report with platform information so that I may fix it. However, the CLI version should still function as before for you, so you will still be able to use that. Furthermore, this update is made when there are no pending changes to the lazer database, so if this update somehow completely breaks for someone, BeatmapExporter 1.3.11 is an equally functional version for exporting until an osu!lazer update. I do not think that this will happen but want to allow a bit of margin for users to test it in action. This update is not required for export functionality.
tl;dr
For the release files below:
BeatmapExporterCLI files are the original command-line program, built on the new platform but should work the same as before.
BeatmapExporter files are the newer program version with a full GUI, please let me know if there are any major issues with the program on your system.