How to uninstall PX4 Windows Toolchain

I want to install the old version of PX4.Windows.Cygwin.Toolchain.0.8, but it says that the new version has been installed. How do I uninstall the new version?
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@MaEtUgR can you help me ?

Did you try Window Add/Remove? If it is an MSI it should be there.

Yes, I have tried it, and the installation is not found in the Windows Control Panel → Uninstall a program. Maybe I missed something, can you tell me his name?