Problem:

After Windows 10  major update the Net Express 5.1 license is corrupted.     
Starting Net Express loads the Micro Focus License management System, which shows the License Status as: “Your Net Express license has been corrupted”.

Resolution:

Some Windows 10 major feature updates delete a number of registry keys that are used by the Net Express license management system.

These registry keys are used when checking for a license and if they are not found the License Manager process will fail to function correctly. 

This will happen when starting Net Express and when starting the License Management System.

Registry keys that may be deleted are:
HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node\\Microsoft\\Windows\\CurrentVersion\\Internet Settings\\{D50D8764-ECB7-4b58-8568-8AF1403B76F1}
HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node\\Microsoft\\Windows\\CurrentVersion\\Internet Settings\\{D50D8764-ECB7-4b58-8568-8AF1403B76F2}

Resolution options include:
- Run command 'protcfg.exe /force_reset', to reset the license.
- Make a backup of the above registry keys before installing a Windows 10 update. Add a process to back up the license registry keys prior to the feature update and restore them after the update is complete. This process would have to be done manually or custom script.