.NET Core was not found

[r3sus]

Hello. Trying to launch DSMapStudio Alpha 5 SP1 .

Prereqs - OK:

• Microsoft .NET Core Runtime - 3.1.0 (x64);
• VC from provided link. (Microsoft Visual C++ 2015-2019 Redistributable (x64) - 14.24.28127)
• Card supports DX11.

However, application says: "To run this application, you must install .NET Core.

The framework 'Microsoft.WindowsDesktop.App', version '3.1.0' was not found.

Would you like to download it now?"

Link leads to the file I already installed.

Reboot, run as adm, google don't help.

Please, have a look.