Hi Panayot Vasilev,
Welcome to the Developing Universal Windows apps
forum!
>>Can I run the Windows 8.1 simulator on a Windows 10 machine?
No, you can not run the Windows 8.1 simulator on the Windows 10 machine, you need the Windows 8.1 OS, I will recommend you install a virtual machine with the Windows 8.1 OS for testing the app.
Best Regards,
Amy Peng
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