VisualStudio 2015 Lizenzkey löschen.

You could take the following steps to change the product Key:

1. Remove registry key HKEY_CLASSES_ROOT\Licenses\4D8CFBCB-2F6A-4AD2-BABF-10E28F6F2C8F
2. After you remove this key, visual studio 2015 will tell you that it's license information is incorrect. Go to „Programs and features“ and repair visual studio 2015.
3. After the repair, visual studio 2015 is reverted to a 30-day trial and you can enter a new product key.

If you couldn’t find the registry key, please use Process Monitor to find the registry Key.

Download Process Monitor from http://technet.microsoft.com/en-us/sysinternals/bb896645.aspx.

After launching visual studio 2015, you could search the “Licenses” or “License” keywords in Process Monitor to find the registry key for visual studio 2015.