Hi,
since the old certificate that has been used to sign the releases for
the vim/vim-win32-installer binaries is going to expire within 14 days,
a new certificate has been created by Signpath.
With the next release (probably tomorrow) that one will be used to sign
the binaries. However, since this means the certificate has not been
used yet, you might see SmartScreen Warnings by Windows, until the
certificate has been in use more widely. If this is a problem for you,
you can install the latest version that has been signed by the old
certificate
https://github.com/vim/vim-win32-installer/releases/tag/v8.2.0577
Thanks,
Christian