Are You Using KEPServerEX HW Keys? Be careful! They Are Incompatible with the Latest Win 10
If you are using a hardware key with your KEPServerEX, we recommend that you postpone installing the latest Win 10 update.
The latest Win 10 is not compatible with hardware keys.
The company PTC strongly recommends that KEPServerEX users who are using KEPServerEX hardware keys do not install the latest Win 10 2004 update, as this can cause serious technical issues or result in a non-functional KEPServerEX.
PTC are doing their best to resolve this issue. It will be fixed via a new drivers update. Microsoft knows about this problem and is also dealing with it.
Unless you update your operating system, your KEPServerEX will work as before.