SOunds really weird
Ive seen this
VisualStudio Bootstrapper:2021/01/07 12:16:17: Package signature verification threw exception: There are no more endpoints available from the endpoint mapper.
, for path: D:\VS\vs_installer.opc"
VisualStudio Bootstrapper:2021/01/07 12:16:17: Unable to verify the certificate: Exception
VisualStudio Bootstrapper:2021/01/07 12:16:17: Caught Exception: Type = InvalidOperationException, Message = Unable to verify the integrity of the installation files: the certificate could not be verified, StackTrace = at Microsoft.VisualStudio.Setup.OpcVerifier.Verify(Stream packageStream, String layoutLocation)
at Microsoft.VisualStudio.Setup.Bootstrapper.Bootstrapper.VerifyLayoutPackage(Stream packageStream)
VisualStudio Bootstrapper:2021/01/07 12:16:17: Signature verification failed. Error: Unable to verify the integrity of the installation files: the certificate could not be verified.
VisualStudio Bootstrapper:2021/01/07 12:16:17: Bootstrapper failed with known error.
if you are installing offline follow this https://learn.microsoft.com/en-us/visualstudio/install/create-an-offline-installation-of-visual-studio?view=vs-2019#how-to-customize-your-offline-%20installer
Install certificates for offline https://learn.microsoft.com/en-us/visualstudio/install/install-certificates-for-visual-studio-offline?view=vs-2019
If not let me know.
Best regards