Uninstall.exe doesn't work

I noticed this post and wanted to update my SDK as said in the Update section.
I went to the SDKs folder and quickly found the uninstall.exe

I double clicked it and this message came up.

I pressed the uninstall button and maybe waited over half an hour but nothing happened. It just shows me the folder I posted in the beginning and my mouse has this loading symbol when it hovers over the folder. I also tried it several times but it still doesn’t work. Also I can just close the folder with the task manager.

I’m working on Windows 7 64-bit and currently have the jMonkeyEngine 3.0.5