Hi Luiz, 
thank you for your quick response. 
I am sorry i did not provide any more information right away! 
What happens for me is this: 
I installed the latest update for Houdini and the GameDev Tools were already installed for the prior versions. While installed i chose to delete the previous version of Houdini. 
When i started the new version of Houdini for the first time. The tools were loaded and work! 
But if i click the Updater Button Houdini just freezes and wont respond anymore. 
Then i force close it and if i start it again the tools have disappeared - only the Update Button left. 
Clicking the Update Button then also brings up the same problem. Houdini wont respond anymore. 
I am not at home now - but i am pretty sure if i would delete and reinstall the GameDev Tools manually it would work again - as long as i dont use that Updater Button! 
My OS is Windows 10.
Thanks for all the hard work and for responding so quick! 
Much appreciated! 
I hope i did not miss anything!