If you are getting this error:
1) Restart your computer. This will make sure a crashed version of the game or launcher is not stuck running in the background. Run the launcher and wait several minutes to process packs. It can take a long time on some files. If you get stuck again, restart and go to step 2.
2) Delete xsyon.exe from your Xsyon/Bin directory.
3) If those steps donít work, try deleting the following files from the Xsyon/Data directory (one at a time) and then run the launcher after each deletion.
Try is this order from smallest to largest file:
What's happening is that part of the Processing Packs takes a long time and you might get the Not Responding message because the window doesn't refresh, however the launcher is still running.
If you stop the process, it could corrupt one of the files apparently. We'll look into this more next week. For now, the above solution should work.